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Income Taxes Domestic Tax Components (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal
Current	$ (405)us-gaap_CurrentFederalTaxExpenseBenefit	$ 108us-gaap_CurrentFederalTaxExpenseBenefit	$ 5,358us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	(5,658)	18,150	13,197
Investment tax credits	(273)us-gaap_InvestmentTaxCredit	(335)us-gaap_InvestmentTaxCredit	(376)us-gaap_InvestmentTaxCredit
State
Current	18	83	(1,411)
Deferred	(3,954)	(3,705)	1,321
Income tax expense (benefit)	$ (10,272)us-gaap_IncomeTaxExpenseBenefit	$ 14,301us-gaap_IncomeTaxExpenseBenefit	$ 18,089us-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.