Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid In Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]	Total
Balances at Dec. 31, 2012	$ 87	$ 47,785	$ (538)	$ 151,829	$ 199,163
Balances (in shares) at Dec. 31, 2012	8,716
Increase (Decrease) in Shareholders' Equity
Net income				11,302	11,302
Unrealized gain (loss) from derivative instruments, net of tax expense (benefit) of $(91) and $260 for the six months ended June 30, 2014 and 2013, respectively			450		450
Shares repurchased		(358)			(358)
Shares repurchased (in shares)	(25)
Shares issued under stock compensation plans	2	504			506
Shares issued under stock compensation plans (in shares)	203
Cancellation of restricted stock units in satisfaction of withholding tax		(480)			(480)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(33)
Stock-based compensation, net of forfeitures		1,715			1,715
Balances at Jun. 30, 2013	89	49,166	(88)	163,131	212,298
Balances (in shares) at Jun. 30, 2013	8,861
Balances at Dec. 31, 2013	84	44,741	325	167,455	212,605
Balances (in shares) at Dec. 31, 2013	8,400
Increase (Decrease) in Shareholders' Equity
Net income				6,545	6,545
Unrealized gain (loss) from derivative instruments, net of tax expense (benefit) of $(91) and $260 for the six months ended June 30, 2014 and 2013, respectively			(158)		(158)
Shares repurchased		(1,214)			(1,214)
Shares repurchased (in shares)	(60)
Shares issued under stock compensation plans	1	330			331
Shares issued under stock compensation plans (in shares)	83
Cancellation of restricted stock units in satisfaction of withholding tax	(1)	(933)			(934)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(49)
Stock-based compensation, net of forfeitures		1,642			1,642
Balances at Jun. 30, 2014	$ 84	$ 44,566	$ 167	$ 174,000	$ 218,817
Balances (in shares) at Jun. 30, 2014	8,374