Statements of Changes in Shareholders' Equity (USD $) In Thousands	Total	Preferred Stock	7.625% Series A Cumulative Redeemable Preferred Stock	7.625% Series A Cumulative Redeemable Preferred Stock Preferred Stock	Common Stock Amount	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Balance at Dec. 31, 2011	$ 2,080,188		$ 0		$ 77	$ 1,904,748	$ 2,041	$ 173,322
Issuance of stock	587,677	278,263		278,263	22	587,655
Share based compensation expense	1,301					1,301
Dividends declared on common stock	(237,203)						(237,203)
Dividends declared on preferred stock	(2,070)						(2,070)
Net income	242,498						242,498
Other comprehensive income	261,902							261,902
Balance at Sep. 30, 2012	$ 3,212,556		$ 278,263		$ 99	$ 2,493,704	$ 5,266	$ 435,224