Net Income (Loss) per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator for earnings per share:
Net income (loss) that is available to common shareholders	$ (78,815)	$ 2,909	$ (86,217)	$ 12,322
Denominator for basic earnings per share:
Weighted average shares outstanding	22,075,318	21,894,017	22,015,008	21,869,922
Denominator for diluted earnings per share:
Effect of stock options and restricted stock units	0	177,176	0	156,304
Adjusted weighted average shares and assumed conversions	22,075,318	22,071,193	22,015,008	22,026,226
Basic earnings (loss) per share	$ (3.57)	$ 0.13	$ (3.92)	$ 0.56
Diluted earnings (loss) per share	$ (3.57)	$ 0.13	$ (3.92)	$ 0.56
Net loss position (excluded from denominator)
Shares excluded from diluted earnings (loss) per share due to:
Shares excluded from diluted earnings (loss) per share due to:	63,488	0	92,051	0
Inclusion would have been anti-dilutive (excluded from calculation)
Shares excluded from diluted earnings (loss) per share due to:
Shares excluded from diluted earnings (loss) per share due to:	893,198	605,032	780,062	619,058

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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