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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Treasury stock
Retained deficit
Accumulated other comprehensive income / (loss)
Balance at beginning of period at Dec. 31, 2020 $ 406,236 $ 60 $ 1,242,720 $ (134,499) $ (601,656) $ (100,389)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 1,896   1,896      
Restricted stock issuance, net of forfeitures (139)   (139)      
Currency translation adjustment 3,152         3,152
Change in pension liability 77         77
Net income (loss) (29,663)       (29,663)  
Balance at end of period at Mar. 31, 2021 381,559 60 1,244,477 (134,499) (631,319) (97,160)
Balance at beginning of period at Dec. 31, 2020 406,236 60 1,242,720 (134,499) (601,656) (100,389)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Currency translation adjustment (2,604)          
Change in pension liability 101          
Net income (loss) (63,056)          
Balance at end of period at Sep. 30, 2021 346,018 61 1,248,061 (134,500) (664,712) (102,892)
Balance at beginning of period at Mar. 31, 2021 381,559 60 1,244,477 (134,499) (631,319) (97,160)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 1,914   1,914      
Restricted stock issuance, net of forfeitures (2)   (2)      
Currency translation adjustment 66         66
Change in pension liability (21)         (21)
Net income (loss) (21,806)       (21,806)  
Balance at end of period at Jun. 30, 2021 361,710 60 1,246,389 (134,499) (653,125) (97,115)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 1,881   1,881      
Restricted stock issuance, net of forfeitures (208) 1 (209)      
Currency translation adjustment (5,822)         (5,822)
Change in pension liability 45         45
Net income (loss) (11,587)       (11,587)  
Balance at end of period at Sep. 30, 2021 346,018 61 1,248,061 (134,500) (664,712) (102,892)
Balance at beginning of period at Dec. 31, 2021 329,126 61 1,249,962 (135,562) (684,307) (101,028)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 2,151   2,151      
Restricted stock issuance, net of forfeitures (360) 1 (361)      
Currency translation adjustment (6,992)         (6,992)
Change in pension liability 30         30
Net income (loss) (9,199)       (9,199)  
Balance at end of period at Mar. 31, 2022 314,756 62 1,251,752 (135,562) (693,506) (107,990)
Balance at beginning of period at Dec. 31, 2021 329,126 61 1,249,962 (135,562) (684,307) (101,028)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Currency translation adjustment (46,199)          
Change in pension liability 153          
Net income (loss) 16,542          
Balance at end of period at Sep. 30, 2022 302,605 62 1,252,945 (135,562) (667,765) (147,075)
Balance at beginning of period at Mar. 31, 2022 314,756 62 1,251,752 (135,562) (693,506) (107,990)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 621   621      
Restricted stock issuance, net of forfeitures (1)   (1)      
Liability awards converted to share settled 275   275      
Currency translation adjustment (16,518)         (16,518)
Change in pension liability 57         57
Net income (loss) 9,264       9,264  
Balance at end of period at Jun. 30, 2022 308,454 62 1,252,647 (135,562) (684,242) (124,451)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 765   765      
Restricted stock issuance, net of forfeitures (467)   (467)      
Treasury stock 0          
Currency translation adjustment (22,690)         (22,690)
Change in pension liability 66         66
Net income (loss) 16,477       16,477  
Balance at end of period at Sep. 30, 2022 $ 302,605 $ 62 $ 1,252,945 $ (135,562) $ (667,765) $ (147,075)