Employee Benefit Plan (Details) - USD ($)
$ in Thousands |
3 Months Ended |
6 Months Ended |
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
| Pension Plan |
|
|
|
|
| Components of net periodic benefit cost |
|
|
|
|
| Service cost |
$ 0
|
$ 0
|
$ 0
|
$ 0
|
| Interest cost |
643
|
587
|
1,250
|
1,237
|
| Expected return on plan assets |
(1,256)
|
(1,207)
|
(2,523)
|
(2,422)
|
| Amortization of net retirement plan actuarial loss |
286
|
249
|
537
|
487
|
| Amortization of net retirement plan prior service (credit) cost |
(3)
|
(4)
|
(5)
|
(7)
|
| Net periodic benefit (income) cost |
(330)
|
(375)
|
(741)
|
(705)
|
| Life and Health Three Months Ended |
|
|
|
|
| Components of net periodic benefit cost |
|
|
|
|
| Service cost |
28
|
47
|
96
|
129
|
| Interest cost |
62
|
65
|
134
|
141
|
| Expected return on plan assets |
0
|
0
|
0
|
0
|
| Amortization of net retirement plan actuarial loss |
13
|
2
|
17
|
3
|
| Amortization of net retirement plan prior service (credit) cost |
(35)
|
4
|
(31)
|
8
|
| Net periodic benefit (income) cost |
68
|
118
|
216
|
281
|
| SERP Benefits |
|
|
|
|
| Components of net periodic benefit cost |
|
|
|
|
| Service cost |
29
|
14
|
83
|
86
|
| Interest cost |
217
|
205
|
426
|
416
|
| Expected return on plan assets |
0
|
0
|
0
|
0
|
| Amortization of net retirement plan actuarial loss |
98
|
75
|
199
|
179
|
| Amortization of net retirement plan prior service (credit) cost |
22
|
8
|
44
|
38
|
| Net periodic benefit (income) cost |
$ 366
|
$ 302
|
$ 752
|
$ 719
|