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Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	(4) Related Party Transactions We engage in various transactions with Devon and other related parties. For the three months ended March 31, 2018 and 2017, Devon accounted for 9.8% and 14.9% of our revenues, respectively. We had an accounts receivable balance related to transactions with Devon of $115.1 million at March 31, 2018 and $102.7 million at December 31, 2017. Additionally, we had an accounts payable balance related to transactions with Devon of $16.0 million at March 31, 2018 and $16.3 million at December 31, 2017. For the three months ended March 31, 2018 and 2017, we recorded cost of sales of $13.0 million and $1.2 million, respectively, related to our purchase of residue gas and NGLs from the Cedar Cove JV subsequent to processing at our Central Oklahoma processing facilities. Management believes these transactions are executed on terms that are fair and reasonable. The amounts related to related party transactions are specified in the accompanying consolidated financial statements.