Other Equities (Schedule Of Other Equities) (Details) - USD ($)		Dec. 31, 2016	Dec. 31, 2015
Schedule Of Other Equities [Line Items]
Total other equities		$ 13,828,075	$ 12,527,856
Nonoperating Margins, Prior To 1967 [Member]
Schedule Of Other Equities [Line Items]
Total other equities		23,625	23,625
Donated Capital [Member]
Schedule Of Other Equities [Line Items]
Total other equities		2,001,450	1,877,193
Unclaimed Capital Credit Retirement [Member]
Schedule Of Other Equities [Line Items]
Total other equities	[1]	$ 11,803,000	$ 10,627,038

[1] Represents unclaimed capital credits that have met all requirements of Alaska Statute section 34.45.200 regarding Alaska's unclaimed property law and has therefore reverted to Chugach.