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Income Taxes - Continuing and Discontinuing Tax (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal Income Tax Expense (Benefit), Continuing Operations	$ 1,152	$ 0	$ 13,224
Amounts attributable to discontinued operations	0	0	600
Total income tax expense (benefit)	1,152us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit	13,824us-gaap_IncomeTaxExpenseBenefit
Discontinued operations
Amounts attributable to discontinued operations		$ 0	$ (18)

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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