Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income
Balance, Amount at Dec. 31, 2011	$ 280,304	$ 1,846	$ 214,505	$ 59,857	$ 4,096
Balance, Shares at Dec. 31, 2011		18,465,444
Net income (loss)	42,852			42,852
Unrealized gain (loss) on derivative instrument net of tax expense/benefit	263				263
Translation adjustment	1,131				1,131
Share-based compensation expense	6,303		6,303
Common shares issued	25,586	88	25,498
Common shares issued, Shares		873,885
Balance, Amount at Dec. 31, 2012	356,439	1,934	246,306	102,709	5,490
Balance, Shares at Dec. 31, 2012		19,339,329
Net income (loss)	(28,812)			(28,812)
Unrealized gain (loss) on derivative instrument net of tax expense/benefit	(279)				(279)
Translation adjustment	(1,708)				(1,708)
Share-based compensation expense	6,267		6,267
Common shares issued	3,450	20	3,430
Common shares issued, Shares		200,584
Retirement of repurchased common stock	(39,494)	(144)	(39,350)
Retirement of repurchased common stock, Shares		(1,437,578)
Balance, Amount at Dec. 31, 2013	295,863	1,810	216,653	73,897	3,503
Balance, Shares at Dec. 31, 2013	18,102,335	18,102,335
Net income (loss)	(8,537)			(8,537)
Unrealized gain (loss) on derivative instrument net of tax expense/benefit	248				248
Translation adjustment	(4,133)				(4,133)
Share-based compensation expense	5,724		5,724
Common shares issued	10,462	51	10,411
Common shares issued, Shares		509,160
Balance, Amount at Dec. 31, 2014	$ 299,627	$ 1,861	$ 232,788	$ 65,360	$ (382)
Balance, Shares at Dec. 31, 2014	18,611,495	18,611,495