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Income Taxes, Balances (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure    
Income taxes receivable $ 113,708us-gaap_IncomeTaxesReceivable $ 2,397us-gaap_IncomeTaxesReceivable
Federal    
Income Tax Disclosure    
Income taxes receivable 108,820us-gaap_IncomeTaxesReceivable
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		  
Income taxes (payable)   20,288us-gaap_AccruedIncomeTaxesCurrent
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
State    
Income Tax Disclosure    
Income taxes receivable $ 4,391us-gaap_IncomeTaxesReceivable
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 $ 2,397us-gaap_IncomeTaxesReceivable
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember