Income Taxes (Details 2) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Operating loss carryforwards
Deferred tax asset		$ 237,500,000
Accounting for Uncertainty in Income Taxes
Amount of unrecognized tax benefits for uncertain tax positions	0	0
Increase or decrease in the amount of unrecognized tax benefits for uncertain tax positions	0	0
Accrued interest related to uncertain tax positions	0	0
Federal
Operating loss carryforwards
Net operating losses		$ 678,600,000