UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 9,547	$ 19,987
Restricted cash	5,005	5,005
Accounts receivable - trade, net	531,791	400,334
Inventories	84,094	77,958
Other	39,162	39,200
Total current assets	669,599	542,484
FIXED ASSETS, at cost	5,519,055	5,464,040
Less: Accumulated depreciation	(1,607,285)	(1,551,855)
Net fixed assets	3,911,770	3,912,185
MINERAL LEASEHOLDS, net of accumulated depletion	547,985	549,005
EQUITY INVESTEES	290,005	294,050
INTANGIBLE ASSETS, net of amortization	126,783	127,063
GOODWILL	301,959	301,959
RIGHT OF USE ASSETS, net	136,386	140,796
OTHER ASSETS, net of amortization	34,712	38,259
TOTAL ASSETS	6,019,199	5,905,801
CURRENT LIABILITIES:
Accounts payable - trade	365,935	264,316
Accrued liabilities	231,270	232,623
Total current liabilities	597,205	496,939
SENIOR SECURED CREDIT FACILITY	94,800	49,000
SENIOR UNSECURED NOTES, net of debt issuance costs	2,932,003	2,930,505
DEFERRED TAX LIABILITIES	14,476	14,297
OTHER LONG-TERM LIABILITIES	437,609	434,925
Total liabilities	4,076,093	3,925,666
MEZZANINE CAPITAL:
Class A Convertible Preferred Units, 25,336,778 issued and outstanding at March 31, 2022 and December 31, 2021	790,115	790,115
Redeemable noncontrolling interests, 250,114 and 246,394 preferred units issued and outstanding at March 31, 2022 and December 31, 2021, respectively	267,242	259,568
PARTNERS’ CAPITAL:
Common unitholders, 122,579,218 units issued and outstanding at March 31, 2022 and December 31, 2021	597,783	641,313
Accumulated other comprehensive loss	(5,485)	(5,607)
Noncontrolling interests	293,451	294,746
Total partners’ capital	885,749	930,452
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ 6,019,199	$ 5,905,801