Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012		Jun. 30, 2011
Net income	$ 17,504	$ 9,018	$ 31,759		$ 19,992
Available-for-sale securities:
Net unrealized gains	1,989	22,837	2,264		21,652
Reclassification of net gains included in net income	(4)	(560)	(66)		(953)
Income tax expense	(835)	(8,863)	(969)		(8,242)
Net unrealized gains on available-for-sale securities	1,150	13,414	1,229		12,457
Cash flow hedges:
Net unrealized gains	5,233		6,379
Reclassification of net gains included in net income	(795)		(1,317)
Income tax expense	(1,753)		(2,001)
Net unrealized gains on cash flow hedges	2,685		3,061
Other comprehensive income	3,835	13,414	4,290	[1]	12,457	[1]
Comprehensive income	21,339	22,432	36,049		32,449
Comprehensive income attributable to noncontrolling interests		(58)			(130)
Comprehensive income attributable to controlling interests	$ 21,339	$ 22,374	$ 36,049		$ 32,319

[1] Net of taxes and reclassification adjustments.