Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Income tax benefit	$ 6,980,000	$ 8,056,000	$ 12,978,000	$ 9,853,000	$ (3,201,000)	$ 0	$ (288,842,000)	$ 0	$ 37,867,000	$ (292,043,000)	$ 0
Effective Income Tax Rate Reconciliation, Percent									29.00%	(311.50%)	0.00%
Deferred tax asset, net	284,059,000				292,082,000				284,059,000	292,082,000
Operating loss and tax credit carryforward included in deferred tax asset	242,300,000				274,000,000				242,300,000	274,000,000
Deferred Tax Assets, Valuation Allowance	$ 1,764,000				$ 1,764,000				$ 1,764,000	$ 1,764,000