CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 19,987	$ 21,282
Restricted cash	5,005	5,736
Accounts receivable—trade, net	400,334	392,465
Inventories	77,958	99,877
Other	39,200	60,809
Total current assets	542,484	580,169
FIXED ASSETS, at cost	5,464,040	5,173,475
Less: Accumulated depreciation	(1,551,855)	(1,322,141)
Net fixed assets	3,912,185	3,851,334
MINERALS LEASEHOLDS, net of accumulated depletion	549,005	552,575
EQUITY INVESTEES	294,050	319,068
INTANGIBLE ASSETS, net of amortization	127,063	128,742
GOODWILL	301,959	301,959
RIGHT OF USE ASSETS, net	140,796	153,925
OTHER ASSETS, net of amortization	38,259	45,847
TOTAL ASSETS	5,905,801	5,933,619
CURRENT LIABILITIES:
Accounts payable—trade	264,316	198,433
Accrued liabilities	232,623	184,978
Total current liabilities	496,939	383,411
SENIOR SECURED CREDIT FACILITY	49,000	643,700
SENIOR UNSECURED NOTES, net of debt issuance costs	2,930,505	2,750,016
DEFERRED TAX LIABILITIES	14,297	13,317
OTHER LONG-TERM LIABILITIES	434,925	393,018
Total liabilities	3,925,666	4,183,462
MEZZANINE CAPITAL
Class A Convertible Preferred Units, 25,336,778 issued and outstanding at December 31, 2021 and 2020	790,115	790,115
Redeemable noncontrolling interests, 246,394 and 141,249 preferred units issued and outstanding at December 31, 2021 and 2020, respectively	259,568	141,194
COMMITMENTS AND CONTINGENCIES (Note 21)
Common units issued (in units)	122,579,218	122,579,218
Common units outstanding (in units)	122,579,218	122,579,218
PARTNERS’ CAPITAL:
Common unitholders, 122,579,218 units issued and outstanding at December 31, 2021 and 2020	$ 641,313	$ 829,326
Accumulated other comprehensive loss	(5,607)	(9,365)
Noncontrolling interests	294,746	(1,113)
Total partners' capital	930,452	818,848
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ 5,905,801	$ 5,933,619