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Unaudited Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Additional Paid-In Capital
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Treasury Stock
Beginning balance at Dec. 31, 2019 $ 1,223,967   $ 726 $ 1,114,521   $ 797,710   $ (67,746) $ (621,244)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (429,667)         (429,667)      
Currency translation adjustments (excluding intercompany advances) (9,148)             (9,148)  
Currency translation adjustments on intercompany advances (6,873)             (6,873)  
Stock-based compensation expense:                  
Restricted stock 3,257   7 3,250          
Surrender of stock to settle taxes on restricted stock awards (2,667)               (2,667)
Ending balance at Jun. 30, 2020 778,869   733 1,117,771   368,043   (83,767) (623,911)
Beginning balance at Dec. 31, 2019 1,223,967   726 1,114,521   797,710   (67,746) (621,244)
Ending balance at Dec. 31, 2020 $ 757,631 $ (9,450) 733 1,122,945 $ (25,683) 329,327 $ 16,233 (71,385) (623,989)
Stock-based compensation expense:                  
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate202006Member                
Beginning balance at Mar. 31, 2020 $ 802,632   732 1,115,677   392,669   (82,537) (623,909)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (24,626)         (24,626)      
Currency translation adjustments (excluding intercompany advances) (442)             (442)  
Currency translation adjustments on intercompany advances (788)             (788)  
Stock-based compensation expense:                  
Restricted stock 2,095   1 2,094          
Surrender of stock to settle taxes on restricted stock awards (2)               (2)
Ending balance at Jun. 30, 2020 778,869   733 1,117,771   368,043   (83,767) (623,911)
Beginning balance at Dec. 31, 2020 757,631 (9,450) 733 1,122,945 $ (25,683) 329,327 $ 16,233 (71,385) (623,989)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (31,081)         (31,081)      
Currency translation adjustments (excluding intercompany advances) 1,624             1,624  
Currency translation adjustments on intercompany advances 7             7  
Stock-based compensation expense:                  
Restricted stock 4,703   6 4,697          
Surrender of stock to settle taxes on restricted stock awards (1,500)               (1,500)
Ending balance at Jun. 30, 2021 721,934   739 1,101,959   314,479   (69,754) (625,489)
Beginning balance at Mar. 31, 2021 732,162 $ 0 738 1,100,077   329,750   (72,914) (625,489)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (15,271)         (15,271)      
Currency translation adjustments (excluding intercompany advances) 556             556  
Currency translation adjustments on intercompany advances 2,604             2,604  
Stock-based compensation expense:                  
Restricted stock 1,883   1 1,882          
Surrender of stock to settle taxes on restricted stock awards 0                
Ending balance at Jun. 30, 2021 $ 721,934   $ 739 $ 1,101,959   $ 314,479   $ (69,754) $ (625,489)