Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2013		10,816,754
Beginning Balance at Dec. 31, 2013	$ 234,271	$ 110	$ (1,924)	$ 68,909	$ 171,038	$ (3,862)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	19,867				19,867
Other comprehensive loss, net of tax	(2,789)					(2,789)
Stock options exercised (in shares)		117,149
Stock options exercised	2,276	$ 1		2,275
Stock repurchased related to the exercise of stock options (in shares)		(34,597)
Stock repurchased related to the exercise of stock options	(920)	$ (1)		(919)
Stock awards vested (in shares)		52,962
Stock awards vested	0	$ 1		(1)
Stock-based compensation	3,725			3,725
Excess tax (expense) benefits from share-based compensation	140			140
Retirement of treasury stock	0	$ (1)	1,924	(1,923)
Ending Balance (in shares) at Dec. 31, 2014		10,952,268
Ending Balance at Dec. 31, 2014	256,570	$ 110	0	72,206	190,905	(6,651)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(74,879)				(74,879)
Other comprehensive loss, net of tax	1,048					1,048
Stock options exercised (in shares)		167,523
Stock options exercised	3,084	$ 1		3,083
Stock repurchased related to the exercise of stock options (in shares)		(137,194)
Stock repurchased related to the exercise of stock options	(4,210)	$ (1)		(4,209)
Stock awards vested (in shares)		101,721
Stock awards vested	0	$ 1		(1)
Stock-based compensation	3,495			3,495
Excess tax (expense) benefits from share-based compensation	626			626
Ending Balance (in shares) at Dec. 31, 2015		11,084,318
Ending Balance at Dec. 31, 2015	185,734	$ 111	0	75,200	116,026	(5,603)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	25,261				25,261
Other comprehensive loss, net of tax	$ (476)					(476)
Stock options exercised (in shares)	132,325	132,325
Stock options exercised	$ 2,122	$ 1		2,121
Stock repurchased related to the exercise of stock options (in shares)		(151,916)
Stock repurchased related to the exercise of stock options	$ (3,465)	$ (1)		(3,464)
Stock awards vested (in shares)	114,325	129,086
Stock awards vested	$ 0	$ 1		(1)
Stock-based compensation	3,007			3,007
Excess tax (expense) benefits from share-based compensation	(80)			(80)
Ending Balance (in shares) at Dec. 31, 2016		11,193,813
Ending Balance at Dec. 31, 2016	$ 212,103	$ 112	$ 0	$ 76,783	$ 141,287	$ (6,079)