Long-Term Debt and Capital Leases Long-Term Debt and Capital Leases (Schedule of Capital Lease Obligation Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Capital Lease Obligations Principal	$ 68,601	$ 74,149
Alaska Electric Light & Power [Member] | Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Lease Obligations Principal Year 1	2,295
Capital Leases Obligations Principal Year 2	2,415
Capital Leases Obligations Principal Year 3	2,535
Capital Leases Obligations Principal Year 4	2,660
Capital Leases Obligations Principal Year 5	2,800
Capital Leases Obligations Principal Thereafter	51,750
Capital Lease Obligations Principal	64,455
Capital Lease Obligations Interest Year 1	3,157
Capital Leases Obligations Interest Year 2	3,042
Capital Leases Obligations Interest Year 3	2,921
Capital Leases Obligations Interest Year 4	2,795
Capital Leases Obligations Interest Year 5	2,662
Capital Leases Obligations Interest Thereafter	19,195
Capital Leases Obligations Interest	33,772
Capital Leases, Future Minimum Payments, Remainder of Fiscal Year	5,452
Capital Leases, Future Minimum Payments Due in Two Years	5,457
Capital Leases, Future Minimum Payments Due in Three Years	5,456
Capital Leases, Future Minimum Payments Due in Four Years	5,455
Capital Leases, Future Minimum Payments Due in Five Years	5,462
Capital Leases, Future Minimum Payments Due Thereafter	70,945
Capital Leases, Future Minimum Payments Due	$ 98,227