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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, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share Reconciliation [Abstract]
Net income	$ 28,169	$ 61,092	$ 16,178	$ 15,185	$ 89,261	$ 31,363
Undistributed income allocated to participating securities	324		242		1,021	433
Net income attributable to common stockholders	27,845		15,936		88,240	30,930
Plus: Net income effect of convertible securities	0		0		8,897	0
Numerator for diluted income per common share	$ 27,845		$ 15,936		$ 97,137	$ 30,930
Basic weighted-average common stock shares outstanding (in shares)	49,960		45,684		49,529	45,659
Dilutive effects of common stock equivalents (in shares)	114		39		6,051	41
Diluted weighted-average common stock shares outstanding (in shares)	50,074		45,723		55,580	45,700
Basic income (loss) per share (in dollars per share)	$ 0.56		$ 0.35		$ 1.78	$ 0.68
Diluted income (loss) per share (in dollars per share)	$ 0.56		$ 0.35		$ 1.75	$ 0.68
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		354		354	354
Restricted Stock Awards
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)			7		8	27
Stock Option Awards
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,900		1,300		1,800	1,300
Convertible Debt Securities
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	5,600		6,400			6,400