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Income (Loss) per Share - Basic and Diluted Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Earnings Per Share Reconciliation [Abstract]              
Net Loss $ (108,958) $ (62,227) $ (40,560) $ (222,337) $ (171,185) $ (262,897)  
Less: Undistributed income allocated to participating securities 0   0   0 0  
Net loss attributable to common stockholders (108,958)   (40,560)   (171,185) (262,897)  
Plus: Net income effect of convertible securities 0   0   0 0  
Numerator for diluted loss per common share $ (108,958)   $ (40,560)   $ (171,185) $ (262,897)  
Basic weighted-average common stock shares outstanding (in shares) 59,367   53,265   56,837 53,246  
Dilutive effects of common stock equivalents (in shares) 0   0   0 0  
Diluted weighted-average common stock shares outstanding (in shares) 59,367   53,265   56,837 53,246  
Basic loss per common share (in dollars per share) $ (1.84)   $ (0.76)   $ (3.01) $ (4.94)  
Diluted loss per common share (in dollars per share) $ (1.84)   $ (0.76)   $ (3.01) $ (4.94)  
5.00% Convertible Senior Notes due 2021              
Earnings Per Share Reconciliation [Abstract]              
Debt instrument, interest rate (in percent)             5.00%
5.00% Convertible Senior Notes due 2021 | Convertible Debt              
Earnings Per Share Reconciliation [Abstract]              
Debt instrument, interest rate (in percent) 5.00%       5.00%    
Restricted Stock Awards              
Earnings Per Share Reconciliation [Abstract]              
Antidilutive securities (in shares) 830   581   828 555  
Stock Option Awards              
Earnings Per Share Reconciliation [Abstract]              
Antidilutive securities (in shares) 2,288   2,309   2,188 2,231  
Convertible Debt Securities              
Earnings Per Share Reconciliation [Abstract]              
Antidilutive securities (in shares) 2,258   2,704   2,480 2,704