Consolidated Statement of Changes in Shareholders' Equity (USD $) In Thousands	Total	7.625% Series A Cumulative Redeemable Preferred Stock	Common Stock Amount	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2012	$ 3,072,864	$ 278,252	$ 99	$ 2,494,303	$ 37,356	$ 262,854
Issuance of stock
Issuance of stock
Share based compensation expense	1,256			1,256
Dividends declared on common stock	(138,362)				(138,362)
Dividends declared on preferred stock	(10,960)				(10,960)
Net income	137,978				137,978
Other comprehensive loss	(583,687)					(583,687)
Balance at Jun. 30, 2013	$ 2,479,089	$ 278,252	$ 99	$ 2,495,559	$ 26,012	$ (320,833)