Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Paid-in Capital in Excess of par	Accumulated Other Comprehensive Income/(Loss)	Retained Earnings
Balances at Dec. 31, 2012	$ 199,553	$ 87	$ 47,785	$ (1,230)	$ 152,911
Balances (in shares) at Dec. 31, 2012		8,716
Increase (Decrease) in Shareholders' Equity
Net income	1,610				1,610
Unrealized gain (loss) from derivative instruments, net of tax expense of $46 and $137 for the three months ended March 31, 2014 and March 31, 2013, respectively	238			238
Shares repurchased	(358)		(358)
Shares repurchased (in shares)		(25)
Shares issued under stock compensation plans	230		230
Shares issued under stock compensation plans (in shares)		20
Cancellation of restricted stock units in satisfaction of withholding tax	(263)		(263)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)		(18)
Stock-based compensation, net of forfeitures	783		783
Balances at Mar. 31, 2013	201,793	87	48,177	(992)	154,521
Balances (in shares) at Mar. 31, 2013		8,693
Balances at Dec. 31, 2013	212,605	84	44,741	325	167,455
Balances (in shares) at Dec. 31, 2013		8,400
Increase (Decrease) in Shareholders' Equity
Net income	4,331				4,331
Unrealized gain (loss) from derivative instruments, net of tax expense of $46 and $137 for the three months ended March 31, 2014 and March 31, 2013, respectively	(79)			(79)
Shares issued under stock compensation plans	212	1	211
Shares issued under stock compensation plans (in shares)		63
Cancellation of restricted stock units in satisfaction of withholding tax	(270)	(1)	(269)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)		(16)
Stock-based compensation, net of forfeitures	758		758
Balances at Mar. 31, 2014	$ 217,557	$ 84	$ 45,441	$ 246	$ 171,786
Balances (in shares) at Mar. 31, 2014		8,447