UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 56,609	$ 10,300
Accounts receivable - trade, net	330,581	323,462
Inventories	72,087	73,531
Other	58,469	35,986
Total current assets	517,746	443,279
FIXED ASSETS, at cost	5,521,434	5,440,858
Less: Accumulated depreciation	(1,212,062)	(1,023,825)
Net fixed assets	4,309,372	4,417,033
MINERAL LEASEHOLDS, net of accumulated depletion	556,993	560,481
NET INVESTMENT IN DIRECT FINANCING LEASES, net of unearned income	110,094	116,925
EQUITY INVESTEES	336,900	355,085
INTANGIBLE ASSETS, net of amortization	142,715	162,602
GOODWILL	301,959	301,959
RIGHT OF USE ASSETS, net	184,723	0
OTHER ASSETS, net of amortization	100,179	121,707
TOTAL ASSETS	6,560,681	6,479,071
CURRENT LIABILITIES:
Accounts payable - trade	188,703	127,327
Accrued liabilities	225,222	205,507
Total current liabilities	413,925	332,834
SENIOR SECURED CREDIT FACILITY	947,000	970,100
SENIOR UNSECURED NOTES, net of debt issuance costs	2,468,033	2,462,363
DEFERRED TAX LIABILITIES	12,872	12,576
OTHER LONG-TERM LIABILITIES	377,167	259,198
Total liabilities	4,218,997	4,037,071
MEZZANINE CAPITAL:
Class A Convertible Preferred Units, 25,336,778 and 24,438,022 issued and outstanding at September 30, 2019 and December 31, 2018, respectively	790,115	761,466
Redeemable noncontrolling interests, 55,000 preferred units issued and outstanding at September 30, 2019	49,672	0
PARTNERS’ CAPITAL:
Common unitholders, 122,579,218 units issued and outstanding at September 30, 2019 and December 31, 2018	1,507,054	1,690,799
Accumulated other comprehensive income	939	939
Noncontrolling interests	(6,096)	(11,204)
Total partners' capital	1,501,897	1,680,534
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ 6,560,681	$ 6,479,071