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Condensed Consolidated Statements of Changes in Stockholders' Equity - 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, 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)      
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)
Balance at beginning of period at Dec. 31, 2022 307,035 62 1,253,613 (138,560) (680,595) (127,485)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 841   841      
Restricted stock issuance, net of forfeitures (1,873) 1 (1,874)      
Conversion of debt to common stock 113,650 46 113,604      
Treasury stock (3,497)     (3,497)    
Currency translation adjustment 4,158         4,158
Change in pension liability 15         15
Net income (loss) (3,486)       (3,486)  
Balance at end of period at Mar. 31, 2023 416,843 109 1,366,184 (142,057) (684,081) (123,312)
Balance at beginning of period at Dec. 31, 2022 307,035 62 1,253,613 (138,560) (680,595) (127,485)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Currency translation adjustment 1,197          
Change in pension liability (15)          
Net income (loss) (2,096)          
Balance at end of period at Sep. 30, 2023 417,120 109 1,368,062 (142,057) (682,691) (126,303)
Balance at beginning of period at Mar. 31, 2023 416,843 109 1,366,184 (142,057) (684,081) (123,312)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 1,257   1,257      
Currency translation adjustment 7,749         7,749
Change in pension liability 6         6
Net income (loss) (6,579)       (6,579)  
Balance at end of period at Jun. 30, 2023 419,276 109 1,367,441 (142,057) (690,660) (115,557)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 1,247   1,247      
Restricted stock issuance, net of forfeitures (626)   (626)      
Currency translation adjustment (10,710)         (10,710)
Change in pension liability (36)         (36)
Net income (loss) 7,969       7,969  
Balance at end of period at Sep. 30, 2023 $ 417,120 $ 109 $ 1,368,062 $ (142,057) $ (682,691) $ (126,303)