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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, 2018	Mar. 31, 2017
Earnings Per Share Reconciliation [Abstract]
Net income	$ 15,185	$ 27,786
Undistributed income allocated to participating securities	192	299
Net income attributable to common stockholders	14,993	27,487
Plus: Net income effect of convertible securities	0	2,509
Numerator for diluted income per common share	$ 14,993	$ 29,996
Basic weighted-average common stock shares outstanding (in shares)	45,634	45,476
Dilutive effects of common stock equivalents (in shares)	43	6,389
Diluted weighted-average common stock shares outstanding (in shares)	45,677	51,865
Basic income (loss) per share (USD per share)	$ 0.33	$ 0.60
Diluted income (loss) per share (USD per share)	$ 0.33	$ 0.58
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)	354	352
Restricted Stock Awards
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	46	120
Stock Option Awards
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,300	2,000
Convertible Debt Securities
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	6,400

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