Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings (Loss) Per Share, Diluted, by Common Class, Including Two Class Method
Basic earnings (loss)	$ 11,715	$ (8,485)	$ (63,253)	$ 65,822
Weighted Average Shares, Basic	35,308,000	34,290,000	34,971,000	31,750,000
Basic earnings (loss) (in dollars per share)	$ 0.33	$ (0.25)	$ (1.81)	$ 2.07
Effect of dilutive securities
Restricted stock awards	$ 0	$ 0	$ 0	$ 0
Restricted stock awards (in shares)	22,000	0	0	234,000
Performance share units	$ 0	$ 0	$ 0	$ 0
Performance share units (in shares)	0	0	0	0
Warrants	$ 0	$ 0	$ 0	$ 0
Warrants (shares)	0	0	0	0
Diluted earnings (loss)	$ 11,715	$ (8,485)	$ (63,253)	$ 65,822
Weighted average shares, diluted	35,330,000	34,290,000	34,971,000	31,984,000
Diluted earnings (loss) per share (in dollars per share)	$ 0.33	$ (0.25)	$ (1.81)	$ 2.06
Performance Share Units
Potentially Dilutive Securities
Antidilutive securities excluded from computation of earnings per share (in shares)	0		0	0
Warrants
Potentially Dilutive Securities
Antidilutive securities excluded from computation of earnings per share (in shares)	0	0	0	0
Restricted Stock awards
Potentially Dilutive Securities
Antidilutive securities excluded from computation of earnings per share (in shares)		100,000	0

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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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