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Long-Term Debt and Capital Leases Long-Term Debt and Capital Leases (Schedule of Capital Lease Obligation Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Capital Lease Obligations Principal $ 62,148 $ 65,435
Alaska Electric Light & Power [Member] | Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Capital Lease Obligations Principal Year 1 2,535  
Capital Leases Obligations Principal Year 2 2,660  
Capital Leases Obligations Principal Year 3 2,800  
Capital Leases Obligations Principal Year 4 2,935  
Capital Leases Obligations Principal Year 5 3,085  
Capital Leases Obligations Principal Thereafter 45,730  
Capital Lease Obligations Principal 59,745  
Capital Lease Obligations Interest Year 1 2,921  
Capital Leases Obligations Interest Year 2 2,795  
Capital Leases Obligations Interest Year 3 2,662  
Capital Leases Obligations Interest Year 4 2,522  
Capital Leases Obligations Interest Year 5 2,375  
Capital Leases Obligations Interest Thereafter 14,300  
Capital Leases Obligations Interest 27,575  
Capital Leases, Future Minimum Payments, Remainder of Fiscal Year 5,456  
Capital Leases, Future Minimum Payments Due in Two Years 5,455  
Capital Leases, Future Minimum Payments Due in Three Years 5,462  
Capital Leases, Future Minimum Payments Due in Four Years 5,457  
Capital Leases, Future Minimum Payments Due in Five Years 5,460  
Capital Leases, Future Minimum Payments Due Thereafter 60,030  
Capital Leases, Future Minimum Payments Due $ 87,320