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Earnings 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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
BASIC
Net income	$ 22,659	$ 4,684	$ 22,072	$ 4,803
Weighted-average common shares outstanding (in shares)	14,070	14,404	14,078	14,427
Basic earnings per share (in dollars per share)	$ 1.61	$ 0.33	$ 1.57	$ 0.33
DILUTED
Net income	$ 22,659	$ 4,684	$ 22,072	$ 4,803
Weighted-average common shares outstanding (in shares)	14,070	14,404	14,078	14,427
Dilutive effect of stock options, restricted stock and common stock warrants (in shares)	88	279	117	273
Weighted-average common shares outstanding on a diluted basis (in shares)	14,158	14,683	14,195	14,700
Diluted earnings per share (in dollars per share)	$ 1.60	$ 0.32	$ 1.55	$ 0.33

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- Definition

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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