UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 11,204	$ 10,300
Accounts receivable - trade, net	307,390	323,462
Inventories	80,147	73,531
Other	41,329	35,986
Total current assets	440,070	443,279
FIXED ASSETS, at cost	5,471,477	5,440,858
Less: Accumulated depreciation	(1,093,199)	(1,023,825)
Net fixed assets	4,378,278	4,417,033
MINERAL LEASEHOLDS, net of accumulated depletion	559,161	560,481
NET INVESTMENT IN DIRECT FINANCING LEASES, net of unearned income	114,704	116,925
EQUITY INVESTEES	350,258	355,085
INTANGIBLE ASSETS, net of amortization	150,494	162,602
GOODWILL	301,959	301,959
RIGHT OF USE ASSETS, net	200,788	0
OTHER ASSETS, net of amortization	119,099	121,707
TOTAL ASSETS	6,614,811	6,479,071
CURRENT LIABILITIES:
Accounts payable - trade	144,629	127,327
Accrued liabilities	258,337	205,507
Total current liabilities	402,966	332,834
SENIOR SECURED CREDIT FACILITY	942,000	970,100
SENIOR UNSECURED NOTES, net of debt issuance costs	2,464,247	2,462,363
DEFERRED TAX LIABILITIES	12,828	12,576
OTHER LONG-TERM LIABILITIES	402,610	259,198
Total liabilities	4,224,651	4,037,071
MEZZANINE CAPITAL:
Class A Convertible Preferred Units, 24,972,598 and 24,438,022 issued and outstanding at March 31, 2019 and December 31, 2018, respectively	778,508	761,466
PARTNERS’ CAPITAL:
Common unitholders, 122,579,218 units issued and outstanding at March 31, 2019 and December 31, 2018	1,621,314	1,690,799
Accumulated other comprehensive income	939	939
Noncontrolling interests	(10,601)	(11,204)
Total partners' capital	1,611,652	1,680,534
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ 6,614,811	$ 6,479,071