Related Party Transactions	6 Months Ended
Jun. 30, 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 and six months ended June 30, 2018, Devon accounted for 11.5% and 10.6% of our revenues, respectively, and for the three and six months ended June 30, 2017, Devon accounted for 15.8% and 15.3% of our revenues, respectively. We had an accounts receivable balance related to transactions with Devon of $122.1 million at June 30, 2018 and $102.7 million at December 31, 2017. Additionally, we had an accounts payable balance related to transactions with Devon of $27.0 million at June 30, 2018 and $16.3 million at December 31, 2017. On July 18, 2018, subsidiaries of Devon sold all of their equity interests in ENLK, ENLC, and the managing member of ENLC to GIP. Accordingly, Devon is no longer an affiliate of ENLK or ENLC. The sale did not affect our commercial arrangements with Devon, except that Devon agreed to extend through 2029 certain existing, fixed-fee gathering and processing contracts related to the Bridgeport plant in North Texas and the Cana plant in Oklahoma. See Note 15—Subsequent Event for additional information regarding Devon’s sale to GIP. For the three and six months ended June 30, 2018, we recorded cost of sales of $9.5 million and $22.5 million, respectively, and for the three and six months ended June 30, 2017, we recorded cost of sales of $4.3 million and $5.5 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. We had an accounts receivable balance related to transactions with Cedar Cove of $0.6 million at June 30, 2018. Additionally, we had an accounts payable balance related to transactions with Cedar Cove of $3.5 million at June 30, 2018. The accounts receivable and payable balances related to transactions with Cedar Cover were immaterial at December 31, 2017. Management believes these transactions are executed on terms that are fair and reasonable to us. The amounts related to related party transactions are specified in the accompanying consolidated financial statements.

(4) Related Party Transactions

We engage in various transactions with Devon and other related parties. For the three and six months ended June 30, 2018, Devon accounted for 11.5% and 10.6% of our revenues, respectively, and for the three and six months ended June 30, 2017, Devon accounted for 15.8% and 15.3% of our revenues, respectively. We had an accounts receivable balance related to transactions with Devon of $122.1 million at June 30, 2018 and $102.7 million at December 31, 2017. Additionally, we had an accounts payable balance related to transactions with Devon of $27.0 million at June 30, 2018 and $16.3 million at December 31, 2017.

On July 18, 2018, subsidiaries of Devon sold all of their equity interests in ENLK, ENLC, and the managing member of ENLC to GIP. Accordingly, Devon is no longer an affiliate of ENLK or ENLC. The sale did not affect our commercial arrangements with Devon, except that Devon agreed to extend through 2029 certain existing, fixed-fee gathering and processing contracts related to the Bridgeport plant in North Texas and the Cana plant in Oklahoma. See Note 15—Subsequent Event for additional information regarding Devon’s sale to GIP.

For the three and six months ended June 30, 2018, we recorded cost of sales of $9.5 million and $22.5 million, respectively, and for the three and six months ended June 30, 2017, we recorded cost of sales of $4.3 million and $5.5 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. We had an accounts receivable balance related to transactions with Cedar Cove of $0.6 million at June 30, 2018. Additionally, we had an accounts payable balance related to transactions with Cedar Cove of $3.5 million at June 30, 2018. The accounts receivable and payable balances related to transactions with Cedar Cover were immaterial at December 31, 2017.

Management believes these transactions are executed on terms that are fair and reasonable to us. The amounts related to related party transactions are specified in the accompanying consolidated financial statements.