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Sales/Exchanges of Assets	12 Months Ended
Sales/Exchanges of Assets	Dec. 31, 2017
Sales of Properties and Contracts
Sales/Exchanges of Assets	Sales/Exchanges of Assets On December 28, 2016, the Company sold a gathering system that primarily gathered gas for third-parties for $75.0 million. In conjunction with this transaction, the Company realized a pre-tax gain of $8.0 million, which is included in gain on sale / exchange of assets in the Statements of Consolidated Operations.