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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
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Earnings Per Share Reconciliation [Abstract]
Net Loss	$ (62,227)	$ (222,337)
Less: Undistributed income allocated to participating securities	0	0
Net loss attributable to common stockholders	(62,227)	(222,337)
Plus: Net income effect of convertible securities	0	0
Numerator for diluted loss per common share	$ (62,227)	$ (222,337)
Basic weighted-average common stock shares outstanding (in shares)	54,280	53,153
Dilutive effects of common stock equivalents (in shares)	0	0
Diluted weighted-average common stock shares outstanding (in shares)	54,280	53,153
Basic loss per common share (in dollars per share)	$ (1.15)	$ (4.18)
Diluted loss per common share (in dollars per share)	$ (1.15)	$ (4.18)
5.00% Convertible Senior Notes due 2021
Earnings Per Share Reconciliation [Abstract]
Debt instrument, interest rate	5.00%		5.00%
5.00% Convertible Senior Notes due 2021 | Convertible Debt
Earnings Per Share Reconciliation [Abstract]
Debt instrument, interest rate	5.00%
Restricted Stock Awards
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities (in shares)	674	437
Stock Option Awards
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities (in shares)	2,086	1,939
Convertible Debt Securities
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities (in shares)	2,704	2,704

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