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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statement of Comprehensive Income [Abstract]
Net income	$ 50,546	$ 35,206	$ 27,304
Other comprehensive income (loss), net of tax :
Unrealized losses on hedging derivatives, net of taxes of $3, $273 and $111 in 2011, 2010 and 2009 respectively	(7)	(278)	(167)
Reclassification of net loss on interest rate corridor	92
Unrealized gains (losses) on available for sale securities		(4)	7
Realized gains on available for-sale securities, net of taxes of $12		(19)
Comprehensive income	$ 50,631	$ 34,905	$ 27,144

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