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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) 0 (139)      
Currency translation adjustment 3,152         3,152
Change in pension liability 77         77
Net 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, 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 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)