Pension Plans, Plan Assets (Details) - Noncontributory Defined-Benefit Pension Plan [Member] - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
$ 140,398
|
$ 130,061
|
$ 128,108
|
| Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
141,479
|
127,077
|
|
| Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
7,685
|
8,880
|
|
| Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
126,245
|
111,701
|
|
| Level 3 [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
7,549
|
6,496
|
7,294
|
| Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
7,549
|
6,496
|
|
| Government Obligations [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
6,276
|
9,009
|
|
| Government Obligations [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Government Obligations [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
6,276
|
9,009
|
|
| Government Obligations [Member] | Level 3 [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
0
|
| Government Obligations [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Non Agency Backed Securities [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
715
|
745
|
|
| Non Agency Backed Securities [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Non Agency Backed Securities [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
715
|
745
|
|
| Non Agency Backed Securities [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Corporate Obligations [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
7,243
|
10,865
|
|
| Corporate Obligations [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Corporate Obligations [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
7,243
|
10,865
|
|
| Corporate Obligations [Member] | Level 3 [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
0
|
| Corporate Obligations [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Partnership/Joint venture [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
932
|
567
|
|
| Partnership/Joint venture [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Partnership/Joint venture [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Partnership/Joint venture [Member] | Level 3 [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
932
|
567
|
1,097
|
| Partnership/Joint venture [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
932
|
567
|
|
| Limited Liability Corporations [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
98,188
|
60,417
|
|
| Limited Liability Corporations [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Limited Liability Corporations [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
98,188
|
60,417
|
|
| Limited Liability Corporations [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Real Estate [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
6,617
|
5,929
|
|
| Real Estate [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Real Estate [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Real Estate [Member] | Level 3 [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
6,617
|
5,929
|
6,197
|
| Real Estate [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
6,617
|
5,929
|
|
| Registered Investments [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
5,708
|
12,151
|
|
| Registered Investments [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
3,839
|
6,224
|
|
| Registered Investments [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
1,869
|
5,927
|
|
| Registered Investments [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Common/Collective Trusts [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
7,334
|
16,479
|
|
| Common/Collective Trusts [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Common/Collective Trusts [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
7,334
|
16,479
|
|
| Common/Collective Trusts [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Hedge Funds [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
4,581
|
8,284
|
|
| Hedge Funds [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Hedge Funds [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
4,581
|
8,284
|
|
| Hedge Funds [Member] | Level 3 [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
$ 0
|
| Hedge Funds [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Common Stock [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
1,516
|
1,985
|
|
| Common Stock [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
1,515
|
1,985
|
|
| Common Stock [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
1
|
0
|
|
| Common Stock [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Preferred Stock [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
119
|
121
|
|
| Preferred Stock [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
107
|
121
|
|
| Preferred Stock [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
12
|
0
|
|
| Preferred Stock [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Forward Foreign Currency Contracts [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
(1)
|
3
|
|
| Forward Foreign Currency Contracts [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Forward Foreign Currency Contracts [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
(1)
|
3
|
|
| Forward Foreign Currency Contracts [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Interest-bearing Cash [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
2,224
|
550
|
|
| Interest-bearing Cash [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
2,224
|
550
|
|
| Interest-bearing Cash [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Interest-bearing Cash [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Derivatives [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
27
|
(28)
|
|
| Derivatives [Member] | Level 1 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
0
|
0
|
|
| Derivatives [Member] | Level 2 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
27
|
(28)
|
|
| Derivatives [Member] | Level 3 [Member] | Recurring [Member] |
|
|
|
| Fair value, assets measured on recurring basis [Abstract] |
|
|
|
| Assets, fair value |
$ 0
|
$ 0
|
|