UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 18,137	$ 29,128
Restricted cash	23,372	27,277
Accounts receivable - trade, net	315,645	417,002
Inventories	70,161	65,137
Other	69,565	54,530
Total current assets	496,880	593,074
FIXED ASSETS, at cost	5,567,710	5,540,596
Less: Accumulated depreciation	(1,311,219)	(1,246,121)
Net fixed assets	4,256,491	4,294,475
MINERAL LEASEHOLDS, net of accumulated depletion	554,862	555,825
NET INVESTMENT IN DIRECT FINANCING LEASES, net of unearned income	105,251	107,702
EQUITY INVESTEES	327,942	334,523
INTANGIBLE ASSETS, net of amortization	136,071	138,927
GOODWILL	301,959	301,959
RIGHT OF USE ASSETS, net	175,889	177,071
OTHER ASSETS, net of amortization	79,113	94,085
TOTAL ASSETS	6,434,458	6,597,641
CURRENT LIABILITIES:
Accounts payable - trade	151,868	218,737
Accrued liabilities	172,941	196,758
Total current liabilities	324,809	415,495
SENIOR SECURED CREDIT FACILITY	977,400	959,300
SENIOR UNSECURED NOTES, net of debt issuance costs	2,463,171	2,469,937
DEFERRED TAX LIABILITIES	12,125	12,640
OTHER LONG-TERM LIABILITIES	366,281	393,850
Total liabilities	4,143,786	4,251,222
MEZZANINE CAPITAL:
Class A Convertible Preferred Units, 25,336,778 issued and outstanding at March 31, 2020 and December 31, 2019	790,115	790,115
Redeemable noncontrolling interests, 130,000 preferred units issued and outstanding at March 31, 2020 and December 31, 2019, respectively	129,219	125,133
PARTNERS’ CAPITAL:
Common unitholders, 122,579,218 units issued and outstanding at March 31, 2020 and December 31, 2019	1,382,126	1,443,320
Accumulated other comprehensive loss	(8,431)	(8,431)
Noncontrolling interests	(2,357)	(3,718)
Total partners' capital	1,371,338	1,431,171
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ 6,434,458	$ 6,597,641