Statement Of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Common Stock Amount [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2008	$ 36	$ 769,159	$ (2,787)	$ (30,121)	$ 736,287
Issuance of restricted stock
Cost of issuance of common stock		(223)			(223)
Share based compensation expense		1,296			1,296
Dividends declared on common stock			(162,891)		(162,891)
Comprehensive income:
Net income			174,400		174,400
Balance at Dec. 31, 2009	36	770,232	8,722	152,723	931,713
Issuance of restricted stock
Issuance of common stock	10	271,363			271,373
Share based compensation expense		1,432			1,432
Dividends declared on common stock			(181,702)		(181,702)
Comprehensive income:
Net income			169,500		169,500
Balance at Dec. 31, 2010	46	1,043,027	(3,480)	105,891	1,145,484
Issuance of restricted stock
Issuance of common stock	31	860,571			860,602
Share based compensation expense		1,150			1,150
Dividends declared on common stock			(278,852)		(278,852)
Comprehensive income:
Net income			284,373		284,373
Balance at Dec. 31, 2011	$ 77	$ 1,904,748	$ 2,041	$ 173,322	$ 2,080,188