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Provision (Benefit) for Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of consolidated income tax provision (benefit)
Current income taxes	$ 314us-gaap_CurrentIncomeTaxExpenseBenefit	$ (12)us-gaap_CurrentIncomeTaxExpenseBenefit	$ (1,144)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income taxes	(150,357)us-gaap_DeferredIncomeTaxExpenseBenefit	2,652us-gaap_DeferredIncomeTaxExpenseBenefit	17,216us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax provision (benefit)	$ (150,043)us-gaap_IncomeTaxExpenseBenefit	$ 2,640us-gaap_IncomeTaxExpenseBenefit	$ 16,072us-gaap_IncomeTaxExpenseBenefit

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

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