UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 3,697	$ 104,300
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	79,752	85,732
Amortization of debt issuance costs	3,184	3,117
Deferred Purchase Price Obligation	53,759	(54,674)
Unit-based and noncash compensation	6,188	5,973
Loss from equity method investees	3,703	3,691
Distributions from equity method investees	26,528	28,715
Loss (gain) on asset sales, net	(6)	530
Long-lived asset impairment	2,127	1,577
Early extinguishment of debt	0	22,020
Write-off of debt issuance costs	0	302
Changes in operating assets and liabilities:
Accounts receivable	(11,557)	36,097
Trade accounts payable	(2,991)	1,200
Accrued expenses	5,848	2,726
Due (to) from affiliate	(1,075)	256
Deferred revenue, net	5,160	(39,671)
Ad valorem taxes payable	(106)	(2,470)
Accrued interest	2,975	2,700
Accrued environmental remediation, net	(3,060)	(2,935)
Other, net	(7,634)	(2,689)
Net cash provided by operating activities	166,492	196,497
Cash flows from investing activities:
Capital expenditures	(137,033)	(86,206)
Proceeds from asset sale	496	2,300
Contributions to equity method investees	0	(21,581)
Other, net	(209)	(579)
Net cash provided by (used in) investing activities	(136,746)	(106,066)
Cash flows from financing activities:
Distributions to unitholders		(134,066)
Borrowings under Revolving Credit Facility	202,000	177,500
Repayments under Revolving Credit Facility	(79,000)	(319,500)
Debt issuance costs	(334)	(15,891)
Payment of redemption and call premiums on senior notes	0	(17,913)
Proceeds from ATM Program common unit issuances, net of costs	0	17,251
Contribution from General Partner	0	465
Issuance of senior notes	0	500,000
Tender and redemption of senior notes	0	(300,000)
Other, net	(3,738)	(2,794)
Net cash provided by (used in) financing activities	(30,806)	(94,948)
Net change in cash and cash equivalents	(1,060)	(4,517)
Cash and cash equivalents, beginning of period	1,430	7,428
Cash and cash equivalents, end of period	370	2,911
Supplemental cash flow disclosures:
Cash interest paid	44,126	47,410
Less capitalized interest	5,536	1,562
Interest paid (net of capitalized interest)	38,590	45,848
Cash paid for taxes	175	0
Noncash investing and financing activities
Capital expenditures in trade accounts payable (period-end accruals)	20,977	13,647
Capital expenditures relating to contributions in aid of construction for Topic 606 day 1 adoption	33,123	0
Common units
Cash flows from financing activities:
Distributions to unitholders	(135,484)	(134,066)
Series A Preferred Units
Cash flows from financing activities:
Distributions to unitholders	$ (14,250)	$ 0