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Subsequent Event (Details) (Parent, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Parent
   
Subsequent Event [Line Items]    
Long-term Debt, Gross $ 2,347,190us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 2,389,165us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember