Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents		$ 201,999	$ 444,922
Accounts receivable, net		436,513	452,880
Other current assets		46,252	45,262
Total current assets		684,764	943,064
Property, plant, and equipment
Cost		12,846,078	12,641,745
Less accumulated depreciation		4,333,171	3,931,800
Net property, plant, and equipment		8,512,907	8,709,945
Goodwill		4,783	4,783
Other intangible assets		744,742	776,409
Equity investments		1,167,187	1,224,813
Other assets	[1]	158,696	171,013
Total assets	[2]	11,273,079	11,830,027
Current liabilities
Accounts and imbalance payables		326,061	210,691
Short-term debt		505,932	438,870
Accrued ad valorem taxes		44,955	41,427
Accrued liabilities		263,249	269,947
Total current liabilities		1,140,197	960,935
Long-term liabilities
Long-term debt		6,400,616	7,415,832
Deferred income taxes		12,425	22,195
Asset retirement obligations		298,275	260,283
Other liabilities		325,806	275,570
Total long-term liabilities		7,037,122	7,973,880
Total liabilities	[3]	8,177,319	8,934,815
Equity and partners' capital
Common units (402,993,919 and 413,839,863 units issued and outstanding at December 31, 2021 and 2020, respectively)		2,966,955	2,778,339
General partner units (9,060,641 units issued and outstanding at December 31, 2021 and 2020)		(8,882)	(17,208)
Total partners' capital		2,958,073	2,761,131
Noncontrolling interests		137,687	134,081
Total equity and partners' capital		3,095,760	2,895,212
Total liabilities, equity, and partners' capital		$ 11,273,079	$ 11,830,027
Common units issued		402,993,919	413,839,863
Common units outstanding		402,993,919	413,839,863
General partner units issued		9,060,641	9,060,641
General partner units outstanding		9,060,641	9,060,641

[1] Other assets includes $9.8 million and $4.2 million of NGLs line-fill inventory as of December 31, 2021 and 2020, respectively. Other assets also includes $56.2 million and $71.9 million of materials and supplies inventory as of December 31, 2021 and 2020, respectively.

[2] Total assets includes related-party amounts of $1.4 billion and $1.6 billion as of December 31, 2021 and 2020, respectively, which includes related-party Accounts receivable, net of $180.2 million and $291.3 million as of December 31, 2021 and 2020, respectively. See Note 6.

[3] Total liabilities includes related-party amounts of $270.5 million and $164.7 million as of December 31, 2021 and 2020, respectively. See Note 6.