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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, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share Reconciliation [Abstract]            
Net Income (Loss) $ (40,560) $ (222,337) $ 28,169 $ 61,092 $ (262,897) $ 89,261
Less: undistributed income allocated to participating securities 0   324   0 1,021
Net income (loss) attributable to common stockholders (40,560)   27,845   (262,897) 88,240
Plus: Net income effect of convertible securities 0   0   0 8,897
Numerator for diluted income (loss) per common share $ (40,560)   $ 27,845   $ (262,897) $ 97,137
Basic weighted-average common stock shares outstanding (in shares) 53,265   49,960   53,246 49,529
Dilutive effects of common stock equivalents (in shares) 0   114   0 6,051
Diluted weighted-average common stock shares outstanding (in shares) 53,265   50,074   53,246 55,580
Basic income (loss) per share (in dollars per share) $ (0.76)   $ 0.56   $ (4.94) $ 1.78
Diluted income (loss) per share (in dollars per share) $ (0.76)   $ 0.56   $ (4.94) $ 1.75
5.00% Convertible Senior Notes due 2021            
Earnings Per Share Reconciliation [Abstract]            
Debt instrument, interest rate 5.00%       5.00%  
Restricted Stock Awards            
Earnings Per Share Reconciliation [Abstract]            
Antidilutive securities excluded from computation of earnings per share (in shares)     8     8
Stock Option Awards            
Earnings Per Share Reconciliation [Abstract]            
Antidilutive securities excluded from computation of earnings per share (in shares)     1,900     1,800
Convertible Debt Securities            
Earnings Per Share Reconciliation [Abstract]            
Antidilutive securities excluded from computation of earnings per share (in shares)     5,600      
Convertible Debt Securities | 5.00% Convertible Senior Notes due 2021            
Earnings Per Share Reconciliation [Abstract]            
Debt instrument, interest rate 5.00%       5.00%  
Warrant            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average number of shares issuable under the common stock warrants (in shares)     354   161 354