Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 27,064	$ 16,017	$ 41,865	$ 28,350
Other comprehensive income:
Net unrealized (loss) gain on available-for-sale securities	(5,080)	12,721	(28)	33,229
Reclassification of unrealized (gain) loss on available-for-sale securities to net income	(5,360)	(454)	(7,050)	(341)
Net unrealized (loss) gain on interest rate agreements	15,468	(5,401)	7,026	(14,196)
Reclassification of unrealized loss on interest rate agreements to net income	26	39	58	99
Total other comprehensive income	5,054	6,905	6	18,791
Total Comprehensive Income	$ 32,118	$ 22,922	$ 41,871	$ 47,141