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Borrowings and Other Financing Instruments, Intercompany Borrowing Arrangements and Other Short-Term Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Notes payable to affiliates $ 500us-gaap_NotesPayableRelatedPartiesClassifiedCurrent $ 470us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
Notes Payable, Other Payables    
Short-term Debt [Line Items]    
Notes payable to affiliates $ 500us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 $ 500us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Weighted average interest rate at period end (percentage) 0.51%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 0.24%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember