Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Materials and supplies inventory		$ 63,100	$ 71,900
Total assets	[1]	11,419,378	11,830,027
Accounts receivable, net		583,652	452,880
Total liabilities	[2]	8,322,932	8,934,815
Related Parties [Member]
Total assets		1,576,164	1,572,526
Accounts receivable, net		289,402	291,253
Total liabilities		250,735	164,655
Natural-Gas Liquids [Member]
NGLs line-fill inventory		$ 11,200	$ 4,200

[1] Total assets includes related-party amounts of $1.6 billion as of September 30, 2021, and December 31, 2020, which includes related-party Accounts receivable, net of $289.4 million and $291.3 million as of September 30, 2021, and December 31, 2020, respectively. See Note 6.

[2] Total liabilities includes related-party amounts of $250.7 million and $164.7 million as of September 30, 2021, and December 31, 2020, respectively. See Note 6.