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Pension Plans and Other Postretirement Benefits Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Plans, as well as Summary of Significant Assumptions for Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension Plans |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets, beginning balance | $ 659,874 |  |  |
Fair value of plan assets, Ending Balance | 583,659 | $ 659,874 |  |
Other Postretirement Benefits |  |  |  |
Change in benefit obligations: |  |  |  |
Benefit obligation, beginning balance | 56,647 | 56,141 |  |
Service cost | 117 | 121 | $ 115 |
Interest cost | 2,168 | 2,340 | 2,483 |
Actuarial (gain) loss | (5,661) | 2,008 |  |
Benefits paid | (2,881) | (3,963) |  |
Benefit obligation, ending balance | 50,390 | 56,647 | 56,141 |
Change in plan assets: |  |  |  |
Fair value of plan assets, beginning balance | 834 | 2,232 |  |
Actual return on plan assets | (253) | 104 |  |
Employer contributions | 2,300 | 2,461 |  |
Benefits paid | (2,881) | (3,963) |  |
Fair value of plan assets, Ending Balance | 0 | 834 | 2,232 |
Funded status | (50,390) | (55,813) |  |
Current liabilities (accrued expenses) | (4,233) | (3,810) |  |
Noncurrent liabilities (pension benefits) | (46,157) | (52,003) |  |
Net pension liability | (50,390) | (55,813) |  |
Prior service benefit | 0 | 48 |  |
Net amount recognized | $ 0 | $ 48 |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |
Discount rate | 4.55% | 3.99% |  |
Rate of compensation increase | 3.50% | 3.50% |  |
U.S. Plans | Pension Plans |  |  |  |
Change in benefit obligations: |  |  |  |
Benefit obligation, beginning balance | $ 685,963 | $ 665,688 |  |
Service cost | 1,043 | 985 | 1,028 |
Interest cost | 26,804 | 28,614 | 30,514 |
Plan amendments | 0 | 0 |  |
Actuarial (gain) loss | (36,844) | 30,539 |  |
Benefits paid | (41,100) | (39,863) |  |
Employee contributions | 0 | 0 |  |
Foreign exchange (gain) loss | 0 | 0 |  |
Settlements/curtailments | 0 | 0 |  |
Other | 0 | 0 |  |
Benefit obligation, ending balance | 635,866 | 685,963 | 665,688 |
Change in plan assets: |  |  |  |
Fair value of plan assets, beginning balance | 580,396 | 538,082 |  |
Actual return on plan assets | (28,457) | 80,613 |  |
Employer contributions | 2,236 | 1,564 |  |
Benefits paid | (41,100) | (39,863) |  |
Employee contributions | 0 | 0 |  |
Foreign exchange (loss) gain | 0 | 0 |  |
Settlements/curtailments | 0 | 0 |  |
Other | 0 | 0 |  |
Fair value of plan assets, Ending Balance | 513,075 | 580,396 | $ 538,082 |
Funded status | (122,791) | (105,567) |  |
Current liabilities (accrued expenses) | (1,342) | (1,267) |  |
Noncurrent liabilities (pension benefits) | (121,449) | (104,300) |  |
Net pension liability | (122,791) | (105,567) |  |
Prior service benefit | 0 | (60) |  |
Net amount recognized | $ 0 | $ (60) |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |
Discount rate | 4.59% | 4.03% | 4.43% | 4.67%
Rate of compensation increase | 0.00% | 0.00% |  |
Foreign Plans | Pension Plans |  |  |  |
Change in benefit obligations: |  |  |  |
Benefit obligation, beginning balance | $ 275,006 | $ 246,280 |  |
Service cost | 3,919 | 2,547 | $ 3,133 |
Interest cost | 5,144 | 5,128 | 6,570 |
Plan amendments | 233 | 0 |  |
Actuarial (gain) loss | (17,885) | 2,783 |  |
Benefits paid | (9,974) | (9,524) |  |
Employee contributions | 182 | 215 |  |
Foreign exchange (gain) loss | (12,632) | 30,711 |  |
Settlements/curtailments | (3,628) | (3,065) |  |
Other | (62) | (69) |  |
Benefit obligation, ending balance | 240,303 | 275,006 | 246,280 |
Change in plan assets: |  |  |  |
Fair value of plan assets, beginning balance | 79,478 | 68,875 |  |
Actual return on plan assets | (1,593) | 6,260 |  |
Employer contributions | 10,700 | 9,316 |  |
Benefits paid | (9,974) | (9,524) |  |
Employee contributions | 182 | 215 |  |
Foreign exchange (loss) gain | (4,519) | 7,470 |  |
Settlements/curtailments | (3,628) | (3,065) |  |
Other | (62) | (69) |  |
Fair value of plan assets, Ending Balance | 70,584 | 79,478 | $ 68,875 |
Funded status | (169,719) | (195,528) |  |
Current liabilities (accrued expenses) | (5,772) | (5,217) |  |
Noncurrent liabilities (pension benefits) | (163,947) | (190,311) |  |
Net pension liability | (169,719) | (195,528) |  |
Prior service benefit | (409) | (269) |  |
Net amount recognized | $ (409) | $ (269) |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |
Discount rate | 2.15% | 1.94% | 2.00% | 2.76%
Rate of compensation increase | 3.63% | 3.18% |  |

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