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Impairment of long-lived assets	9 Months Ended
Impairment of long-lived assets	Sep. 30, 2015
Asset Impairment Charges [Abstract]
Impairment of long-lived assets	Impairment of long-lived assets During the second quarter of 2015, the Company recognized an impairment of coalbed natural gas gathering assets at the pipeline and energy services segment of $3.0 million, which is recorded in operation and maintenance expense on the Consolidated Statements of Income. The impairment is related to coalbed natural gas gathering assets located in Wyoming where there has been continued decline in natural gas development and production activity largely due to low natural gas prices. The coalbed natural gas gathering assets were written down to their estimated fair value that was determined using the income approach. The Company is negotiating a purchase and sale agreement for the sale of certain non-strategic natural gas gathering assets at the pipeline and energy services segment and, as a result, recognized an impairment during the third quarter of 2015 of $14.1 million, largely related to these assets, which is recorded in operation and maintenance expense on the Consolidated Statements of Income. The natural gas gathering assets were written down to their estimated fair value that was determined using the market approach. For more information on these nonrecurring fair value measurements, see Note 13.