Statements Of Changes In Shareholders' Equity (USD $) In Thousands	Common Stock Amount [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance at Dec. 31, 2011	$ 77	$ 1,904,748	$ 2,041	$ 173,322	$ 2,080,188
Issuance of restricted stock
Issuance of common stock	21	562,162			562,183
Share based compensation expense		429			429
Dividends declared on common stock			(69,889)		(69,889)
Net income			69,304		69,304
Other comprehensive income (loss)				27,085	27,085
Balance at Mar. 31, 2012	$ 98	$ 2,467,339	$ 1,456	$ 200,407	$ 2,669,300