Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 11,878	$ 9,041
Accounts receivable - trade, net	365,646	495,449
Inventories	85,722	88,653
Assets held for sale	255,519	0
Other	42,659	42,890
Total current assets	761,424	636,033
FIXED ASSETS, at cost	5,405,984	5,601,015
Less: Accumulated depreciation	(882,833)	(734,986)
Net fixed assets	4,523,151	4,866,029
MINERAL LEASEHOLDS, net of accumulated depletion	561,593	564,506
NET INVESTMENT IN DIRECT FINANCING LEASES, net of unearned income	119,093	125,283
EQUITY INVESTEES	356,468	381,550
INTANGIBLE ASSETS, net of amortization	168,291	182,406
GOODWILL	325,046	325,046
OTHER ASSETS, net of amortization	120,102	56,628
TOTAL ASSETS	6,935,168	7,137,481
CURRENT LIABILITIES:
Accounts payable - trade	194,489	270,855
Accrued liabilities	235,517	185,409
Total current liabilities	430,006	456,264
SENIOR SECURED CREDIT FACILITY	1,220,700	1,099,200
SENIOR UNSECURED NOTES, net of debt issuance costs	2,460,486	2,598,918
DEFERRED TAX LIABILITIES	12,293	11,913
OTHER LONG-TERM LIABILITIES	275,823	256,571
Total liabilities	4,399,308	4,422,866
MEZZANINE CAPITAL:
Class A Convertible Preferred Units, 23,914,890 and 22,411,728 issued and outstanding at September 30, 2018 and December 31, 2017, respectively	744,727	697,151
PARTNERS’ CAPITAL:
Common unitholders, 122,579,218 units issued and outstanding at September 30, 2018 and December 31, 2017	1,799,409	2,026,147
Accumulated other comprehensive loss	(604)	(604)
Noncontrolling interests	(7,672)	(8,079)
Total partners' capital	1,791,133	2,017,464
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ 6,935,168	$ 7,137,481