Label	Element	Value
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	$ 174,193,000
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	179,464,000
Non Asset Retirement Obligation Removal Cost [Member]
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	26,543,000
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	19,891,000
Transmission Costs [Member]
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	5,476,000
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	6,019,000
Elm Road Regulatory Liability [Member]
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	2,515,000
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	2,322,000
PurchasedGasAdjustmentMember [Member]
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	1,864,000
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	1,186,000
Deferred Fuel Savings [Member]
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	1,794,000
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	9,504,000
Renewable Energy Credits [Member]
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	558,000
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	700,000
Other Regulatory Liability [Member]
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	1,066,000
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	1,074,000
Income Taxes [Member]
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	129,528,000
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	135,449,000
Pension and Other Postretirement Plans Costs [Member]
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	4,499,000
Regulatory Liabilities	us-gaap_RegulatoryLiabilities	$ 3,669,000