Income (Loss) per Share - Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Earnings Per Share Reconciliation [Abstract]
Net Income (Loss)	$ (222,337)	$ 61,092
Less: undistributed income allocated to participating securities	0	693
Net income (loss) attributable to common stockholders	(222,337)	60,399
Plus: Net income effect of convertible securities	0	2,756
Numerator for diluted income (loss) per common share	$ (222,337)	$ 63,155
Basic weighted-average common stock shares outstanding (in shares)	53,153	49,127
Dilutive effects of common stock equivalents (in shares)	0	6,423
Diluted weighted-average common stock shares outstanding (in shares)	53,153	55,550
Basic income (loss) per share (in dollars per share)	$ (4.18)	$ 1.23
Diluted income (loss) per share (in dollars per share)	$ (4.18)	$ 1.14
5.00% Convertible Senior Notes due 2021
Earnings Per Share Reconciliation [Abstract]
Debt instrument, interest rate	5.00%
Restricted Stock Awards
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)		359
Stock Option Awards
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)		1,900
Convertible Debt Securities \| 5.00% Convertible Senior Notes due 2021
Earnings Per Share Reconciliation [Abstract]
Debt instrument, interest rate	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)	249		354

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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