Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income	$ 16,017	$ 65,573	$ 28,350	$ 126,183
Other comprehensive income (loss):
Net unrealized gain (loss) on available-for-sale securities	12,721	(38,012)	33,229	(28,982)
Reclassification of unrealized (gain) loss on available-for-sale securities to net income	(454)	(242)	(341)	(12,249)
Net unrealized (loss) gain on interest rate agreements	(5,401)	13,585	(14,196)	21,025
Reclassification of unrealized loss on interest rate agreements to net income	39	69	99	157
Total other comprehensive income (loss)	6,905	(24,600)	18,791	(20,049)
Total Comprehensive Income	$ 22,922	$ 40,973	$ 47,141	$ 106,134