Consolidated Statements of Shareholders' Equity and Comprehensive Income (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	Comprehensive Income
Balances at Dec. 31, 2010	$ 226,970	$ 31,915	$ 92	$ 60,108	$ (10,469)	$ 145,324
Balances (in shares) at Dec. 31, 2010			9,181
Increase (Decrease) in Stockholders' Equity
Net income	8,545					8,545	8,545
Unrealized gain from derivative instruments, net of tax expense of $425 and $371 for the six months ended June 30, 2012 and June 30, 2011, respectively	642				642		642
Total comprehensive income	9,187						9,187
Preferred stock dividends paid	(1,564)					(1,564)
Shares repurchased	(5,296)		(4)	(5,292)
Shares repurchased (in shares)			(403)
Cash settlement of stock options	(175)			(175)
Cash settlement of stock options (in shares)			23
Shares issued under stock compensation plans	538		2	536
Shares issued under stock compensation plans (in shares)			191
Cancellation of restricted stock units in satisfaction of withholding tax	(468)			(468)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)			(35)
Stock-based compensation, net of forfeitures	1,477			1,477
Excess tax benefit from stock-based compensation	425			425
Balances at Jun. 30, 2011	231,094	31,915	90	56,611	(9,827)	152,305
Balances (in shares) at Jun. 30, 2011			8,957
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 Stockholders' Equity
Net income	6,518					6,518	6,518
Unrealized gain from derivative instruments, net of tax expense of $425 and $371 for the six months ended June 30, 2012 and June 30, 2011, respectively	737				737		737
Total comprehensive income	7,255						7,255
Preferred stock dividends paid	(1,564)					(1,564)
Shares repurchased	(1,793)		(2)	(1,791)
Shares repurchased (in shares)			(141)
Shares issued under stock compensation plans	1,227		4	1,223
Shares issued under stock compensation plans (in shares)			430
Cancellation of restricted stock units in satisfaction of withholding tax	(603)			(603)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)			(47)
Stock-based compensation, net of forfeitures	1,603			1,603
Excess tax benefit from stock-based compensation	685			685
Balances at Jun. 30, 2012	$ 243,471	$ 31,915	$ 93	$ 57,959	$ (8,154)	$ 161,658
Balances (in shares) at Jun. 30, 2012			9,352