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Income (Loss) Per Share - Commutation of Basic and Diluted Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income (loss)	$ 19,005	$ 18,824	$ 7,006	$ 27,786	$ 13,687	$ (27,761)	$ (13,088)	$ (18,673)	$ 72,621	$ (45,835)	$ (39,911)
Undistributed income allocated to participating securities									878	0	0
Net income (loss) attributable to common stockholders									71,743	(45,835)	(39,911)
Plus: Net income effect of convertible securities									0	0	0
Numerator for diluted income (loss) per common share									$ 71,743	$ (45,835)	$ (39,911)
Basic weighted-average common stock shares outstanding (in shares)									45,543	42,349	37,678
Add dilutive effects of common stock equivalents (in shares)									40	0	0
Diluted weighted-average common stock shares outstanding (in shares)									45,583	42,349	37,678
Basic (USD per share)	$ 0.41	$ 0.41	$ 0.15	$ 0.60	$ 0.30	$ (0.67)	$ (0.32)	$ (0.46)	$ 1.58	$ (1.08)	$ (1.06)
Diluted (USD per share)	$ 0.41	$ 0.41	$ 0.15	$ 0.58	$ 0.30	$ (0.67)	$ (0.32)	$ (0.46)	$ 1.57	$ (1.08)	$ (1.06)

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- Definition

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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