Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2010	$ 254,185	$ 106	$ (1,924)	$ 61,684	$ 197,421	$ (3,102)
Beginning Balance (in shares) at Dec. 31, 2010		10,507,143
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(47,583)				(47,583)
Other comprehensive income (loss), net of tax	(4,223)					(4,223)
Cash dividends	(790)				(790)
Stock options exercised (in shares)	79,937	96,605
Stock options exercised	1,553	1		1,552
Stock repurchased related to the exercise of stock options (in shares)		(63,185)
Stock repurchased related to the exercise of stock options	(1,497)			(1,497)
Stock-based compensation	2,363			2,363
Income tax benefit (shortfall) related to the exercise of nonqualified stock options	276			276
Ending Balance at Dec. 31, 2011	204,284	107	(1,924)	64,378	149,048	(7,325)
Ending Balance (in shares) at Dec. 31, 2011		10,540,563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	16,437				16,437
Other comprehensive income (loss), net of tax	(143)					(143)
Stock options exercised (in shares)	0	69,498
Stock options exercised	0	0		0
Stock repurchased related to the exercise of stock options (in shares)		(15,296)
Stock repurchased related to the exercise of stock options	(186)			(186)
Stock-based compensation	1,959			1,959
Income tax benefit (shortfall) related to the exercise of nonqualified stock options	324			324
Ending Balance at Dec. 31, 2012	222,675	107	(1,924)	66,475	165,485	(7,468)
Ending Balance (in shares) at Dec. 31, 2012		10,594,765
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	9,343				9,343
Other comprehensive income (loss), net of tax	3,606					3,606
Stock options exercised (in shares)	437,937	487,163
Stock options exercised	8,775	5		8,770
Stock repurchased related to the exercise of stock options (in shares)		(265,174)
Stock repurchased related to the exercise of stock options	(6,807)	(2)		(6,805)
Stock-based compensation	2,438			2,438
Income tax benefit (shortfall) related to the exercise of nonqualified stock options	(336)			(336)
Ending Balance at Dec. 31, 2013	$ 239,694	$ 110	$ (1,924)	$ 70,542	$ 174,828	$ (3,862)
Ending Balance (in shares) at Dec. 31, 2013		10,816,754