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Long-Term Debt Deferred Financing Costs (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Senior Unsecured Notes Due 2014 [Member]
     
Debt Instrument [Line Items]      
Deferred Finance Costs Remaining, Noncurrent $ 634    
Amortization Expense for Deferred Financing Costs 462 462 462
Senior Unsecured Notes Due 2020 [Member]
     
Debt Instrument [Line Items]      
Deferred Finance Costs Remaining, Noncurrent 1,260    
Amortization Expense for Deferred Financing Costs 167 167 77
First Mortgage Bonds Due 2032 [Member]
     
Debt Instrument [Line Items]      
Deferred Finance Costs Remaining, Noncurrent 651    
Amortization Expense for Deferred Financing Costs 33 33 33
First Mortgage Bonds Due 2039 [Member]
     
Debt Instrument [Line Items]      
Deferred Finance Costs Remaining, Noncurrent 2,037    
Amortization Expense for Deferred Financing Costs 76 76 76
First Mortgage Bonds Due 2037 [Member]
     
Debt Instrument [Line Items]      
Deferred Finance Costs Remaining, Noncurrent 766    
Amortization Expense for Deferred Financing Costs 31 31 31
Project Financing Debt Due 2016 [Member]
     
Debt Instrument [Line Items]      
Deferred Finance Costs Remaining, Noncurrent 3,177    
Amortization Expense for Deferred Financing Costs 1,037 1,012 1,036
Deferred Financing Costs, Other [Member]
     
Debt Instrument [Line Items]      
Deferred Finance Costs Remaining, Noncurrent 721    
Amortization Expense for Deferred Financing Costs $ 57 $ 70 $ 74