CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance at Dec. 31, 2012	$ 37,247	$ (866)	$ 282,708	$ (65,598)	$ 10,241	$ 263,732
Balance, shares at Dec. 31, 2012	37,246,655
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				(14,422)		(14,422)
Issuance of common stock	$ 176		1,453			1,629
Issuance of common stock, shares	175,790
Common stock issued from option exercises, net of tax benefits	$ 158		1,495			$ 1,653
Common stock issued from option exercises, net of tax benefits, shares	158,272					605,494
Common stock issued from cashless option exercises, net of tax benefits	$ 140		4,702	(4,842)
Common stock issued from cashless option exercises, net of tax benefits, shares	140,228
Stock-based compensation			3,157			$ 3,157
Stock-based income tax benefit			1,061			1,061
Other comprehensive loss (income), net of reclassification adjustments and tax					(9,683)	(9,683)
Balance at Dec. 31, 2013	$ 37,721	(866)	294,576	(84,862)	558	247,127
Balance (in shares) at Dec. 31, 2013	37,720,945
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				57,109		57,109
Common stock issued from option exercises, net of tax benefits	$ 9		94			$ 103
Common stock issued from option exercises, net of tax benefits, shares	9,249					113,334
Common stock issued from cashless option exercises, net of tax benefits	$ 30		459	(489)
Common stock issued from cashless option exercises, net of tax benefits, shares	29,208
Common stock issued from vested stock, net of tax benefits	$ 49		(49)
Common stock issued from vested stock, net of tax benefits, shares	49,375
Stock-based compensation			2,641			$ 2,641
Stock-based income tax benefit			266			266
Other comprehensive loss (income), net of reclassification adjustments and tax					11,777	11,777
Balance at Dec. 31, 2014	$ 37,809	(866)	297,987	(28,242)	12,335	319,023
Balance (in shares) at Dec. 31, 2014	37,808,777
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				13,432		$ 13,432
Common stock issued from option exercises, net of tax benefits, shares						132,960
Common stock issued from restricted shares, cashless exercise, net of tax benefits	$ 52		587	(639)
Common stock issued from restricted shares, cashless exercise, net of tax benefits, shares	52,441
Stock-based compensation			1,975			$ 1,975
Other comprehensive loss (income), net of reclassification adjustments and tax					(14,429)	(14,429)
Balance at Dec. 31, 2015	$ 37,861	$ (866)	$ 300,549	$ (15,449)	$ (2,094)	$ 320,001
Balance (in shares) at Dec. 31, 2015	37,861,218