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Earnings (Loss) Per Share - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
BASIC
Net income (loss)	$ (5,061)	$ (1,005)	$ 22,659	$ (587)	$ (6,066)	$ 22,072
Weighted-average common shares outstanding (in shares)	13,863		14,070		13,845	14,078
Basic earnings (loss) per share (in dollars per share)	$ (0.37)		$ 1.61		$ (0.44)	$ 1.57
DILUTED
Net income (loss)	$ (5,061)	$ (1,005)	$ 22,659	$ (587)	$ (6,066)	$ 22,072
Weighted-average common shares outstanding (in shares)	13,863		14,070		13,845	14,078
Dilutive effect of stock options, restricted stock and common stock warrants (in shares)	0		88		0	117
Weighted-average common shares outstanding on a diluted basis (in shares)	13,863		14,158		13,845	14,195
Diluted earnings (loss) per share (in dollars per share)	$ (0.37)		$ 1.60		$ (0.44)	$ 1.55

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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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