Consolidated Statements Of Shareholders' Equity And Comprehensive Income (USD $) In Thousands	Preferred Stock [Member]	Common Stock [Member]	Paid-In Capital In Excess Of Par [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Retained Earnings [Member]	Total
Balances at Dec. 31, 2009	$ 31,915	$ 92	$ 60,671	$ (8,287)	$ 136,402	$ 220,793
Balances, shares at Dec. 31, 2009		9,182
Net income					8,040	8,040
Unrealized loss from derivative instruments, net of tax benefit				(6,542)		(6,542)
Total comprehensive income						1,498
Preferred stock dividends paid					(2,346)	(2,346)
Shares repurchased			(1,777)			(1,777)
Shares repurchased, shares		(178)
Shares issued under stock compensation plans		2	594			596
Shares issued under stock compensation plans, shares		363
Stock-based compensation expense			1,870			1,870
Excess tax benefit from stock-based compensation			341			341
Balances at Sep. 30, 2010	31,915	94	61,699	(14,829)	142,096	220,975
Balances, shares at Sep. 30, 2010		9,367
Balances at Dec. 31, 2010	31,915	92	60,108	(10,469)	145,324	226,970
Balances, shares at Dec. 31, 2010		9,181
Net income					10,860	10,860
Unrealized loss from derivative instruments, net of tax benefit				(127)		(127)
Total comprehensive income						10,733
Preferred stock dividends paid					(2,346)	(2,346)
Shares repurchased		(4)	(5,380)			(5,384)
Shares repurchased, shares		(410)
Cash settlement of stock options		(2)	(1,260)			(1,262)
Cash settlement of stock options, shares		(172)
Shares issued under stock compensation plans		6	109			115
Shares issued under stock compensation plans, shares		555
Stock-based compensation expense			2,301			2,301
Excess tax benefit from stock-based compensation			903			903
Balances at Sep. 30, 2011	$ 31,915	$ 92	$ 56,781	$ (10,596)	$ 153,838	$ 232,030
Balances, shares at Sep. 30, 2011		9,154