Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Paid-in Capital in Excess of par	Accumulated Other Comprehensive Income	Retained Earnings	Total
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 loss from derivative instruments, net of tax expense of $46			(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
Balances at Dec. 31, 2014	$ 83	42,076		174,702	216,861
Balances (in shares) at Dec. 31, 2014	8,346
Increase (Decrease) in Shareholders' Equity
Net income				1,806	1,806
Shares repurchased	$ (1)	(2,038)			(2,039)
Shares repurchased (in shares)	(108)
Shares issued under stock compensation plans	$ 1	84			85
Shares issued under stock compensation plans (in shares)	26
Cancellation of restricted stock units in satisfaction of withholding tax	$ (1)	(861)			(862)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(43)
Stock-based compensation, net of forfeitures		1,947			1,947
Tax benefit on disqualified disposition of shares		130			130
Balances at Jun. 30, 2015	$ 82	$ 41,338		$ 176,508	$ 217,928
Balances (in shares) at Jun. 30, 2015	8,221