Long-Term Debt Long-Term Debt (Schedule of Capital Lease Obligation Maturities) (Details) (Alaska Electric Light & Power [Member], Capital Lease Obligations [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Alaska Electric Light & Power [Member] | Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Lease Obligations Principal Year 1	$ 2,230
Capital Leases Obligations Principal Year 2	2,350
Capital Leases Obligations Principal Year 3	2,480
Capital Leases Obligations Principal Year 4	2,615
Capital Leases Obligations Principal Year 5	2,755
Capital Leases Obligations Principal Thereafter	57,525
Capital Lease Obligations Principal	69,955
Capital Lease Obligations Interest Year 1	3,690
Capital Leases Obligations Interest Year 2	3,567
Capital Leases Obligations Interest Year 3	3,438
Capital Leases Obligations Interest Year 4	3,305
Capital Leases Obligations Interest Year 5	3,165
Capital Leases Obligations Interest Thereafter	25,364
Capital Leases Obligations Interest	42,529
Capital Leases, Future Minimum Payments Due in Two Years	5,917
Capital Leases, Future Minimum Payments Due in Three Years	5,918
Capital Leases, Future Minimum Payments Due in Four Years	5,920
Capital Leases, Future Minimum Payments Due in Five Years	5,920
Capital Leases, Future Minimum Payments Due Thereafter	82,889
Capital Leases, Future Minimum Payments Due	$ 112,484