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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in-Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2016	$ 207,475	$ 1,300	$ 92,432	$ 138,789	$ (25,046)
Beginning Balance, shares at Dec. 31, 2016		12,996
Issuance of restricted stock awards		$ 7	(7)
Issuance of restricted stock awards, shares		74
Exercise of stock options	334	$ 29	305
Exercise of stock options, shares		289
Shares withheld related to net share settlement	(2,021)	$ (15)	(2,006)
Shares withheld related to net share settlement, shares		(154)
Share-based compensation	3,660		3,660
Net income	29,963			29,963
Ending Balance at Dec. 31, 2017	239,411	$ 1,321	94,384	168,752	(25,046)
Ending Balance, shares at Dec. 31, 2017		13,205
Issuance of restricted stock awards		$ 10	(10)
Issuance of restricted stock awards, shares		97
Exercise of stock options	$ 8	$ 8
Exercise of stock options, shares	89	89
Shares withheld related to net share settlement	$ (515)	$ (6)	(509)
Shares withheld related to net share settlement, shares		(57)
Share-based compensation	2,504		2,504
Net income	17,126			17,126
Ending Balance at Jun. 30, 2018	$ 258,534	$ 1,333	$ 96,369	$ 185,878	$ (25,046)
Ending Balance, shares at Jun. 30, 2018		13,334

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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