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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
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension Plans |  |  |
Change in plan assets: |  |  |
Fair value of plan assets, beginning balance | $ 606,957 |  |
Fair value of plan assets, Ending Balance | 659,874 | $ 606,957 |
Other Postretirement Benefits |  |  |
Change in benefit obligations: |  |  |
Benefit obligation, beginning balance | 56,141 | 56,499 |
Service cost | 121 | 115 | $ 137
Interest cost | 2,340 | 2,483 | 2,573
Actuarial loss | 2,008 | 1,529 |
Benefits paid | (3,963) | (4,485) |
Benefit obligation, ending balance | 56,647 | 56,141 | 56,499
Change in plan assets: |  |  |
Fair value of plan assets, beginning balance | 2,232 | 3,292 |
Actual return on plan assets | 104 | 442 |
Employer contributions | 2,461 | 2,983 |
Benefits paid | (3,963) | (4,485) |
Fair value of plan assets, Ending Balance | 834 | 2,232 | 3,292
Funded status | (55,813) | (53,909) |
Current liabilities (accrued expenses) | (3,810) | (3,371) |
Noncurrent liabilities (pension benefits) | (52,003) | (50,538) |
Net pension liability | (55,813) | (53,909) |
Prior service benefit | 48 | 143 |
Net amount recognized | $ 48 | $ 143 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 3.99% | 4.35% |
Rate of compensation increase | 3.50% | 3.50% |
U.S. Plans | Pension Plans |  |  |
Change in benefit obligations: |  |  |
Benefit obligation, beginning balance | $ 665,688 | $ 682,839 |
Service cost | 985 | 1,028 | 1,233
Interest cost | 28,614 | 30,514 | 30,235
Actuarial loss | 30,539 | 7,357 |
Benefits paid | (39,863) | (56,050) |
Divestitures | 0 | 0 |
Employee contributions | 0 | 0 |
Foreign exchange loss (gain) | 0 | 0 |
Settlements/curtailments | 0 | 0 |
Other | 0 | 0 |
Benefit obligation, ending balance | 685,963 | 665,688 | 682,839
Change in plan assets: |  |  |
Fair value of plan assets, beginning balance | 538,082 | 555,084 |
Actual return on plan assets | 80,613 | 37,725 |
Employer contributions | 1,564 | 1,323 |
Benefits paid | (39,863) | (56,050) |
Employee contributions | 0 | 0 |
Foreign exchange gain (loss) | 0 | 0 |
Settlements/curtailments | 0 | 0 |
Other | 0 | 0 |
Fair value of plan assets, Ending Balance | 580,396 | 538,082 | 555,084
Funded status | (105,567) | (127,606) |
Current liabilities (accrued expenses) | (1,267) | (1,100) |
Noncurrent liabilities (pension benefits) | (104,300) | (126,506) |
Net pension liability | (105,567) | (127,606) |
Prior service benefit | (60) | (136) |
Net amount recognized | $ (60) | $ (136) |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 4.03% | 4.43% |
Rate of compensation increase | 0.00% | 0.00% |
Foreign Plans | Pension Plans |  |  |
Change in benefit obligations: |  |  |
Benefit obligation, beginning balance | $ 246,280 | $ 245,747 |
Service cost | 2,547 | 3,133 | 3,909
Interest cost | 5,128 | 6,570 | 6,405
Actuarial loss | 2,783 | 28,083 |
Benefits paid | (9,524) | (9,793) |
Divestitures | 0 | (6,372) |
Employee contributions | 215 | 245 |
Foreign exchange loss (gain) | 30,711 | (21,724) |
Settlements/curtailments | (3,065) | (427) |
Other | (69) | 818 |
Benefit obligation, ending balance | 275,006 | 246,280 | 245,747
Change in plan assets: |  |  |
Fair value of plan assets, beginning balance | 68,875 | 64,911 |
Actual return on plan assets | 6,260 | 12,534 |
Employer contributions | 9,316 | 10,911 |
Benefits paid | (9,524) | (9,793) |
Employee contributions | 215 | 245 |
Foreign exchange gain (loss) | 7,470 | (10,492) |
Settlements/curtailments | (3,065) | 0 |
Other | (69) | 559 |
Fair value of plan assets, Ending Balance | 79,478 | 68,875 | $ 64,911
Funded status | (195,528) | (177,405) |
Current liabilities (accrued expenses) | (5,217) | (5,216) |
Noncurrent liabilities (pension benefits) | (190,311) | (172,189) |
Net pension liability | (195,528) | (177,405) |
Prior service benefit | (269) | (322) |
Net amount recognized | $ (269) | $ (322) |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 1.94% | 2.00% |
Rate of compensation increase | 3.18% | 3.18% |

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