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Income Taxes - Summary of Income Tax Expense Benefit (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Federal	$ 310us-gaap_CurrentFederalTaxExpenseBenefit	$ 160us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State	12	7	7
Deferred
Federal	3,440	(30,540)	0
State	782	(10,012)	(7)
Income tax provision (benefit)	$ 4,544us-gaap_IncomeTaxExpenseBenefit	$ (40,385)us-gaap_IncomeTaxExpenseBenefit	$ 0us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.