Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Materials and supplies inventory		$ 60,300	$ 71,900
Total assets	[1]	11,626,299	11,830,027
Accounts receivable, net		519,116	452,880
Total liabilities	[2]	8,573,426	8,934,815
Related Parties [Member]
Total assets		1,584,304	1,572,526
Accounts receivable, net		278,913	291,253
Total liabilities		222,830	164,655
Natural-Gas Liquids [Member]
NGLs line-fill inventory		$ 7,700	$ 4,200

[1] Total assets includes related-party amounts of $1.6 billion as of June 30, 2021, and December 31, 2020, which includes related-party Accounts receivable, net of $278.9 million and $291.3 million as of June 30, 2021, and December 31, 2020, respectively. See Note 6.

[2] Total liabilities includes related-party amounts of $222.8 million and $164.7 million as of June 30, 2021, and December 31, 2020, respectively. See Note 6.