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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share Reconciliation [Abstract]
Net income	$ (5,822)	$ 18,824	$ 25,541	$ 53,616
Undistributed income allocated to participating securities	0	238	361	685
Net income (loss) attributable to common stockholders	(5,822)	18,586	25,180	52,931
Plus: Net income effect of convertible securities	0	2,566	0	0
Numerator for diluted income (loss) per common share	$ (5,822)	$ 21,152	$ 25,180	$ 52,931
Basic weighted-average common stock shares outstanding (in shares)	45,709	45,561	45,676	45,505
Dilutive effects of common stock equivalents (in shares)	0	6,431	45	22
Diluted weighted-average common stock shares outstanding (in shares)	45,709	51,992	45,721	45,527
Basic income (loss) per share (USD per share)	$ (0.13)	$ 0.41	$ 0.55	$ 1.16
Diluted income (loss) per share (USD per share)	$ (0.13)	$ 0.41	$ 0.55	$ 1.16
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)		31	33	83
Stock Option Awards
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)		1,300	1,300	1,500
Convertible Debt Securities
Earnings Per Share Reconciliation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	6,400		6,400	6,400

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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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