Income Taxes - Income Tax Expense (Benefit) Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%		35.00%
Tax at the statutory federal rate	$ 178,465	$ (866)
State income taxes (net of federal benefit)	17,846	(87)
(Decrease) increase in valuation allowance	(89,300)	807
Other	(106)	146
Total income tax expense	$ 106,905	$ 0