Pension and Other Retirement Plans (Narrative) (Details)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2016
USD ($)
employee
|
Dec. 31, 2015
USD ($)
employee
|
Dec. 31, 2014
USD ($)
employee
|
| Defined Benefit Plan Disclosure |
|
|
|
| Pension settlement |
|
$ 14,964
|
$ 7,648
|
| 401(K) plan |
|
|
|
| Defined Contribution Plans |
|
|
|
| Maximum pretax contribution per employee |
100.00%
|
|
|
| Defined contribution plan, employer matching contribution, percent |
1.50%
|
|
|
| Expense recognized |
$ 977
|
1,013
|
987
|
| Other Postretirement Benefit Plan |
|
|
|
| Defined Benefit Plan Disclosure |
|
|
|
| Recorded liabilities |
1,342
|
1,429
|
|
| Net periodic pension (benefit) cost |
(43)
|
13
|
630
|
| Actuarial gains (losses) |
$ 74
|
$ 202
|
$ 15
|
| Pension Plan |
|
|
|
| Defined Benefit Plan Disclosure |
|
|
|
| Discount rate of projected benefit obligation |
3.80%
|
4.00%
|
|
| Discount rate, net periodic pension expense (benefit) |
4.00%
|
4.00%
|
4.00%
|
| Expected long-term return on plan assets |
6.50%
|
6.50%
|
6.50%
|
| Net periodic pension (benefit) cost |
$ 3,442
|
$ (10,344)
|
$ (4,109)
|
| Actuarial gains (losses) |
(884)
|
$ 2,540
|
$ (49,243)
|
| Plan Settlements |
|
|
|
| Defined benefit plan, total participants accepting pay-out | employee |
|
1,000
|
700
|
| Defined Benefit Plan, Settlements, Plan Assets |
|
$ 100,877
|
$ 52,919
|
| Defined Benefit Plan, Settlements, Benefit Obligation |
|
5,000
|
15,000
|
| Recognized settlement loss |
|
$ 14,964
|
7,648
|
| Defined Benefit Plan, Estimated Future Employer Contributions |
|
|
|
| Estimated future employer contributions in 2016 |
$ 0
|
|
|
| Defined Contribution Plans |
|
|
|
| Number Of Employees Covered By Employer Sponsored Pension Plans | employee |
2,300
|
|
|
| Pension Plan | Required Contributions [Member] |
|
|
|
| Defined Benefit Plan Disclosure |
|
|
|
| Employer contributions |
|
|
9,927
|
| Pension Plan | Voluntary Contributions [Member] |
|
|
|
| Defined Benefit Plan Disclosure |
|
|
|
| Employer contributions |
|
|
$ 20,000
|
| Pension Plan | Equity Securities |
|
|
|
| Defined Benefit Plan, Assets, Target Allocations |
|
|
|
| Target allocation of plans' assets |
50.00%
|
|
|
| Defined Benefit Plan, Assets for Plan Benefits |
|
|
|
| Allocation of plans' assets |
44.80%
|
|
|
| Pension Plan | Fixed Income Securities |
|
|
|
| Defined Benefit Plan, Assets, Target Allocations |
|
|
|
| Target allocation of plans' assets |
50.00%
|
|
|
| Defined Benefit Plan, Assets for Plan Benefits |
|
|
|
| Allocation of plans' assets |
55.20%
|
|
|