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

v3.21.2
Benefit Plans - Change in Benefit Obligation and Plan Assets (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Plan
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Number of defined benefit pension plans | Plan 3    
Ecoservices      
Defined Benefit Plan Disclosure [Line Items]      
Number of defined benefit pension plans | Plan 2    
Defined Benefit Pension Plans      
Change in plan assets:      
Fair value of plan assets at beginning of period $ 87,815    
Fair value of plan assets at end of the period 102,605 $ 87,815  
Defined Benefit Pension Plans | U.S.      
Change in benefit obligation:      
Benefit obligation at beginning of period 82,726 74,445  
Service cost 769 978 $ 1,019
Interest cost 2,665 3,099 2,943
Participant contributions 0 0  
Plan curtailments 0 (2,795)  
Plan settlements (1,455) (1,669)  
Benefits paid (1,511) (1,350)  
Expenses paid 0 0  
Actuarial (gains) losses 8,743 10,018  
Translation adjustment 0 0  
Benefit obligation at end of the period 91,937 82,726 74,445
Change in plan assets:      
Fair value of plan assets at beginning of period 69,450 55,905  
Actual return on plan assets 11,539 12,464  
Employer contributions 2,372 4,100  
Employee contributions 0 0  
Plan settlements (1,455) (1,669)  
Benefits paid (1,511) (1,350)  
Expenses paid 0 0  
Translation adjustment 0 0  
Fair value of plan assets at end of the period 80,395 69,450 55,905
Funded status of the plans (underfunded) (11,542) (13,276)  
Changes in actuarial (gains) losses due to discount rates 8,938 8,978  
Changes in actuarial (gains) losses due to demographic experience 343 2,017  
Changes in actuarial (gains) losses due to mortality assumptions 538 977  
Defined Benefit Plan, Accumulated Benefit Obligation 91,937 82,326  
Defined Benefit Pension Plans | Foreign      
Change in benefit obligation:      
Benefit obligation at beginning of period 19,673 15,877  
Service cost 1,080 977 712
Interest cost 299 355 365
Participant contributions 112 110  
Plan curtailments (1,603) 0  
Plan settlements 0 0  
Benefits paid (213) (198)  
Expenses paid (60) (67)  
Actuarial (gains) losses 949 2,951  
Translation adjustment 1,973 (332)  
Benefit obligation at end of the period 22,210 19,673 15,877
Change in plan assets:      
Fair value of plan assets at beginning of period 18,365 17,079  
Actual return on plan assets 1,238 874  
Employer contributions 820 926  
Employee contributions 112 110  
Plan settlements 0 0  
Benefits paid (213) (198)  
Expenses paid (60) (67)  
Translation adjustment 1,948 (359)  
Fair value of plan assets at end of the period 22,210 18,365 17,079
Funded status of the plans (underfunded) 0 (1,308)  
Changes in actuarial (gains) losses due to discount rates 1,440 3,134  
Changes in actuarial (gains) losses due to demographic experience 70 161  
Changes in actuarial (gains) losses due to mortality assumptions 421 22  
Defined Benefit Plan, Accumulated Benefit Obligation 0 19,335  
Other Postretirement Benefits Plans      
Change in benefit obligation:      
Benefit obligation at beginning of period 554 780  
Service cost 0 10 16
Interest cost 19 29 37
Plan amendments 0 (460)  
Benefits paid (2) (3)  
Premiums paid (3) (3)  
Actuarial (gains) losses 82 201  
Benefit obligation at end of the period 650 554 $ 780
Change in plan assets:      
Fair value of plan assets at beginning of period 0    
Employer contributions 5 6  
Benefits paid (2) (3)  
Premiums paid (3) (3)  
Fair value of plan assets at end of the period 0 0  
Funded status of the plans (underfunded) (650) (554)  
Changes in actuarial (gains) losses due to discount rates 83 148  
Changes in actuarial (gains) losses due to demographic experience 4 51  
Changes in actuarial (gains) losses due to mortality assumptions 3 2  
Underfunded and Unfunded Plans      
Change in plan assets:      
Funded status of the plans (underfunded) $ 11,542 $ 13,276