Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock	Common Stock	Paid-in Capital in Excess of par	Accumulated Other Comprehensive Income/(Loss)	Retained Earnings
Balances at Dec. 31, 2011	$ 236,661	$ 31,915	$ 91	$ 56,842	$ (8,891)	$ 156,704
Balances (in shares) at Dec. 31, 2011			9,110
Increase (Decrease) in Shareholders' Equity
Net income	3,289					3,289
Unrealized gain from derivative instruments, net of tax expense of $54 and $137 for the 3 months ended March 31, 2012 and 2013, respectively	94				94
Preferred stock dividends paid	(782)					(782)
Shares repurchased	(1,793)		(2)	(1,791)
Shares repurchased (in shares)			(141)
Shares issued under stock compensation plans	291		3	288
Shares issued under stock compensation plans (in shares)			256
Cancellation of restricted stock units in satisfaction of withholding tax	(232)			(232)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)			(18)
Stock-based compensation, net of forfeitures	751			751
Excess tax benefit from stock-based compensation	213			213
Balances at Mar. 31, 2012	238,492	31,915	92	56,071	(8,797)	159,211
Balances (in shares) at Mar. 31, 2012			9,207
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 from derivative instruments, net of tax expense of $54 and $137 for the 3 months ended March 31, 2012 and 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