Annual report pursuant to Section 13 and 15(d)

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

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Benefit Plans - Change in Benefit Obligation and Plan Assets (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
plan
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Number Of Defined Benefit Pension Plans | plan 2    
Defined Benefit Pension Plans      
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period $ 102,605    
Fair value of plan assets at end of the period 82,914 $ 102,605  
Defined Benefit Pension Plans | United States      
Defined Benefit Plan, Change in Benefit Obligation      
Benefit obligation at beginning of period 91,937 82,726  
Service cost 0 769 $ 978
Interest cost 2,210 2,665 3,099
Participant contributions 0 0  
Plan curtailments 0 0  
Plan settlements (1,795) (1,455)  
Benefits paid (2,069) (1,511)  
Expenses paid 0 0  
Actuarial (gains) losses (3,818) 8,743  
Translation adjustment 0 0  
Benefit obligation at end of the period 86,465 91,937 82,726
Changes in actuarial (gains) losses due to discount rates (3,989) 8,938  
Changes in actuarial (gains) losses due to demographic experience (545) 343  
Changes in actuarial (gains) losses due to mortality assumptions 204 (538)  
Actuarial Gain (Loss), General Experience 512    
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 80,395 69,450  
Actual return on plan assets 6,383 11,539  
Employer contributions 0 2,372  
Employee contributions 0 0  
Plan settlements (1,795) (1,455)  
Benefits paid (2,069) (1,511)  
Expenses paid 0 0  
Translation adjustment 0 0  
Fair value of plan assets at end of the period 82,914 80,395 69,450
Funded status of the plans (underfunded) (3,551) (11,542)  
Defined Benefit Plan, Accumulated Benefit Obligation 86,465 91,937  
Defined Benefit Pension Plans | Foreign      
Defined Benefit Plan, Change in Benefit Obligation      
Benefit obligation at beginning of period 22,210 19,673  
Service cost 0 1,080 977
Interest cost 255 299 355
Participant contributions 0 112  
Plan curtailments 0 (1,603)  
Plan settlements (21,622) 0  
Benefits paid 0 (213)  
Expenses paid 0 (60)  
Actuarial (gains) losses 0 949  
Translation adjustment (843) 1,973  
Benefit obligation at end of the period 0 22,210 19,673
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 22,210 18,365  
Actual return on plan assets 255 1,238  
Employer contributions 0 820  
Employee contributions 0 112  
Plan settlements (21,622) 0  
Benefits paid 0 (213)  
Expenses paid 0 (60)  
Translation adjustment (843) 1,948  
Fair value of plan assets at end of the period 0 22,210 18,365
Funded status of the plans (underfunded) 0 0  
Underfunded and Unfunded Plans      
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Funded status of the plans (underfunded) 3,551 11,542  
Other Postretirement Benefits Plans      
Defined Benefit Plan, Change in Benefit Obligation      
Benefit obligation at beginning of period 650 554  
Service cost 0 0 10
Interest cost 17 19 29
Benefits paid (1) (2)  
Premiums paid 2 3  
Actuarial (gains) losses (40) 82  
Benefit obligation at end of the period 624 650 $ 554
Changes in actuarial (gains) losses due to discount rates (27) 83  
Changes in actuarial (gains) losses due to demographic experience (12) (4)  
Changes in actuarial (gains) losses due to mortality assumptions (1) 3  
Defined Benefit Plan, Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 0    
Employer contributions 3 5  
Benefits paid (1) (2)  
Premiums paid 2 3  
Fair value of plan assets at end of the period 0 0  
Funded status of the plans (underfunded) $ (624) $ (650)