Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Comprehensive Income [Abstract]
Unrealized (loss) gain on cash flow hedge, tax	$ 6	$ (192)	$ 372
Reclassification adjustment for loss on cash flow hedge included in net income, tax	(71)	(275)	(1,329)
Unrealized gain (loss) on securities, tax	(1)	12	2
Reclassification adjustment for loss (gain) on sale of securities included in net income, tax	$ (1)	$ (8)	$ 3