Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Change in Benefit Obligation and Plan Assets (Details)

v3.10.0.1
Benefit Plans - Change in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Pension Plans      
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period $ 314,892    
Fair value of plan assets at end of the period 287,542 $ 314,892  
Defined Benefit Pension Plans | U.S.      
Defined Benefit Plan, Change in Benefit Obligation      
Benefit obligation at beginning of period 261,102 247,418  
Service cost 1,019 1,219 $ 2,130
Interest cost 9,599 10,115 7,680
Participant contributions 0 0  
Plan amendments 0 0  
Plan curtailments (952) 0  
Plan settlements 0 (2,264)  
Benefits paid (11,453) (9,591)  
Expenses paid 0 0  
Net transfer in 0 0  
Actuarial (gains) losses (13,004) 14,205  
Translation adjustment 0 0  
Benefit obligation at end of the period 246,311 261,102 247,418
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 218,374 198,915  
Actual return on plan assets (12,854) 27,554  
Employer contributions 1,688 3,760  
Employee contributions 0 0  
Plan settlements 0 (2,264)  
Benefits paid (11,453) (9,591)  
Expenses paid 0 0  
Acquisitions 0 0  
Translation adjustment 0 0  
Fair value of plan assets at end of the period 195,755 218,374 198,915
Funded status of the plans (underfunded) (50,556) (42,728)  
Defined Benefit Pension Plans | Foreign      
Defined Benefit Plan, Change in Benefit Obligation      
Benefit obligation at beginning of period 119,710 106,025  
Service cost 3,566 3,686 2,106
Interest cost 3,340 3,271 2,224
Participant contributions 570 493  
Plan amendments 179 0  
Plan curtailments (340) 0  
Plan settlements (1,071) 0  
Benefits paid (2,569) (2,967)  
Expenses paid (363) (319)  
Net transfer in 1,535 0  
Actuarial (gains) losses (5,432) (2,169)  
Translation adjustment (7,022) 11,690  
Benefit obligation at end of the period 112,103 119,710 106,025
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 96,518 86,145  
Actual return on plan assets (540) 217  
Employer contributions 4,249 3,781  
Employee contributions 570 493  
Plan settlements (1,071) 0  
Benefits paid (2,569) (2,967)  
Expenses paid (363) (319)  
Acquisitions 1,013 0  
Translation adjustment (6,020) 9,168  
Fair value of plan assets at end of the period 91,787 96,518 86,145
Funded status of the plans (underfunded) (20,316) (23,192)  
Supplemental Retirement Plans      
Defined Benefit Plan, Change in Benefit Obligation      
Benefit obligation at beginning of period 12,781 13,225  
Interest cost 450 489 328
Benefits paid (1,070) (1,179)  
Actuarial (gains) losses (293) 246  
Benefit obligation at end of the period 11,868 12,781 13,225
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 0 0  
Employer contributions 1,070 1,179  
Benefits paid (1,070) (1,179)  
Fair value of plan assets at end of the period 0 0 0
Funded status of the plans (underfunded) (11,868) (12,781)  
Other Postretirement Benefits Plans      
Defined Benefit Plan, Change in Benefit Obligation      
Benefit obligation at beginning of period 4,612 4,620  
Service cost 16 21 37
Interest cost 150 174 151
Participant contributions 251 251  
Plan amendments (271) 0  
Benefits paid (1,061) (923)  
Medical subsidies received 74 0  
Premiums paid 66 3  
Actuarial (gains) losses 172 418  
Translation adjustment (63) 54  
Benefit obligation at end of the period 3,814 4,612 4,620
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 0 0  
Employer contributions 802 675  
Employee contributions 251 251  
Benefits paid (1,061) (923)  
Medical subsidies received 74 0  
Premiums paid 66 3  
Fair value of plan assets at end of the period 0 0 $ 0
Funded status of the plans (underfunded) $ (3,814) $ (4,612)