Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Rights [Member]	Treasury Stock	Additional paid-in capital	Accumulated deficit
Beginning Balance at Dec. 31, 2012	$ 149,393	$ 215	$ 0	$ (7,479)	$ 3,200,067	$ (3,043,410)
Beginning Balance (in shares) at Dec. 31, 2012		218,126,000		(539,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	80	0			80
Issuance of common stock (in shares)		8,000
Share-based compensation	9,370				9,370
Restricted stock issued, net of cancellations (in shares)		(227,000)
Restricted stock issued, net of cancellations	0	0
Common stock dividends	(21,679)					(21,679)
Net income (loss)	243,718					243,718
Ending Balance at Jun. 30, 2013	380,882	215	0	(7,479)	3,209,517	(2,821,371)
Ending Balance (in shares) at Jun. 30, 2013		217,907,000		(539,000)
Subscription Rights Issued at Jun. 30, 2013			0
Beginning Balance at Dec. 31, 2013	147,905	215	55	(7,479)	3,219,748	(3,064,634)
Beginning Balance (in shares) at Dec. 31, 2013		218,783,000		(539,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	271,901	55	(55)		271,901
Issuance of common stock (in shares)		54,579,000	(54,575,000)
Share-based compensation	6,200				6,200
Restricted stock issued, net of cancellations (in shares)		(84,000)
Restricted stock issued, net of cancellations	0	0
Common stock dividends	(27,111)					(27,111)
Net income (loss)	(2,313)					(2,313)
Ending Balance at Jun. 30, 2014	$ 396,582	$ 270	$ 0	$ (7,479)	$ 3,497,849	$ (3,094,058)
Ending Balance (in shares) at Jun. 30, 2014		273,278,000		(539,000)
Subscription Rights Issued at Jun. 30, 2014	0		0