Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 19,167	$ 1,532	$ 54,489	$ 25,406
Other comprehensive income:
Change in market value of available-for-sale investments	44,905	7,145	80,671	13,310
Reclassification adjustment for available-for-sale amounts included in statement of income	(3,275)	(581)	(3,275)	(1,323)
Change in fair value of interest rate swaps	(11,073)	(18,251)	(28,853)	(31,974)
Reclassification adjustment for interest expense amounts included in statement of income	3,827	3,383	10,602	8,325
Other comprehensive income (loss)	34,384	(8,304)	59,145	(11,662)
Total comprehensive income	53,551	(6,772)	113,634	13,744
Preferred Stock Dividends, Income Statement Impact	(814)	0	(814)	0
Comprehensive Income to Common Shareholders	$ 52,737	$ (6,772)	$ 112,820	$ 13,744