Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2014	$ 299,627	$ 1,861	$ 232,788	$ 65,360	$ (382)
Balance, Shares at Dec. 31, 2014		18,611,495
Net income (loss)	(2,809)			(2,809)
Other comprehensive income (loss), net of tax	(5,850)				(5,850)
Share-based compensation	7,214		7,214
Common shares issued	3,704	$ 34	3,670
Common shares issued, Shares		342,192
Retirement of repurchased common stock	(11,575)	$ (29)	(11,546)
Retirement of repurchased common stock, Shares		(293,991)
Ending Balance at Dec. 31, 2015	290,311	$ 1,866	232,126	62,551	(6,232)
Balance, Shares at Dec. 31, 2015		18,659,696
Cumulative effect adjustment from adoption of ASU 2016-09	604		2,032	(1,428)
Net income (loss)	3,056			3,056
Other comprehensive income (loss), net of tax	(348)				(348)
Share-based compensation	15,966		15,966
Common shares issued	17,313	$ 71	17,242
Common shares issued, Shares		713,140
Retirement of repurchased common stock	$ (63,425)	$ (154)	(63,271)
Retirement of repurchased common stock, Shares	(1,544,681)	(1,544,681)
Ending Balance at Dec. 31, 2016	$ 263,477	$ 1,783	204,095	64,179	(6,580)
Balance, Shares at Dec. 31, 2016	17,828,155	17,828,155
Net income (loss)	$ 6,223			6,223
Other comprehensive income (loss), net of tax	10,367				10,367
Share-based compensation	12,557		12,557
Common shares issued	3,984	$ 45	3,939
Common shares issued, Shares		450,678
Ending Balance at Dec. 31, 2017	$ 296,608	$ 1,828	$ 220,591	$ 70,402	$ 3,787
Balance, Shares at Dec. 31, 2017	18,278,833	18,278,833