Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2010
Operating Loss Carryforwards [Line Items]
Income Tax Expense	$ 12,978,000	$ (288,842,000)	$ 22,831,000	$ (288,842,000)
Effective Tax Rate	0.00%		0.00%
Deferred tax asset, net	290,377,000		290,377,000		292,082,000
Tax preservation rights plan, per investor maximum acquisition percentage of common stock outstanding						5.00%
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Reserved net deferred tax asset					292,100,000
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards	$ 260,200,000		$ 260,200,000		$ 274,000,000