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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 (449,636)         (449,636)      
Currency translation adjustments (excluding intercompany advances) (4,524)             (4,524)  
Currency translation adjustments on intercompany advances (8,140)             (8,140)  
Stock-based compensation expense:                  
Restricted stock 5,346   7 5,339          
Surrender of stock to settle taxes on restricted stock awards (2,675)               (2,675)
Ending balance at Sep. 30, 2020 764,338   733 1,119,860   348,074   (80,410) (623,919)
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] Accounting Standards Update 2020-06 [Member]                
Beginning balance at Jun. 30, 2020 $ 778,869   733 1,117,771   368,043   (83,767) (623,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (19,969)         (19,969)      
Currency translation adjustments (excluding intercompany advances) 4,624             4,624  
Currency translation adjustments on intercompany advances (1,267)             (1,267)  
Stock-based compensation expense:                  
Restricted stock 2,089     2,089          
Surrender of stock to settle taxes on restricted stock awards (8)               (8)
Ending balance at Sep. 30, 2020 764,338   733 1,119,860   348,074   (80,410) (623,919)
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 (44,123)         (44,123)      
Currency translation adjustments (excluding intercompany advances) (1,649)             (1,649)  
Currency translation adjustments on intercompany advances (2,558)             (2,558)  
Stock-based compensation expense:                  
Restricted stock 6,251   6 6,245          
Surrender of stock to settle taxes on restricted stock awards (1,595)               (1,595)
Ending balance at Sep. 30, 2021 704,507   739 1,103,507   301,437   (75,592) (625,584)
Beginning balance at Jun. 30, 2021 721,934   739 1,101,959   314,479   (69,754) (625,489)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (13,042)         (13,042)      
Currency translation adjustments (excluding intercompany advances) (3,273)             (3,273)  
Currency translation adjustments on intercompany advances (2,565)             (2,565)  
Stock-based compensation expense:                  
Restricted stock 1,548     1,548          
Surrender of stock to settle taxes on restricted stock awards (95)               (95)
Ending balance at Sep. 30, 2021 $ 704,507   $ 739 $ 1,103,507   $ 301,437   $ (75,592) $ (625,584)