UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (3,845)	$ (583)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	26,526	28,418
Amortization of debt issuance costs	1,040	1,032
Deferred Purchase Price Obligation	21,658	20,883
Unit-based and noncash compensation	1,962	2,128
(Income) loss from equity method investees	(1,386)	656
Distributions from equity method investees	9,644	8,944
(Gain) loss on asset sales, net	(74)	3
Long-lived asset impairment	0	284
Early extinguishment of debt	0	22,020
Changes in operating assets and liabilities:
Accounts receivable	3,490	43,695
Trade accounts payable	(3,294)	(4,042)
Accrued expenses	1,472	718
Due (to) from affiliate	(645)	228
Deferred revenue, net	1,130	(38,485)
Ad valorem taxes payable	(4,495)	(6,522)
Accrued interest	3,073	(11,780)
Accrued environmental remediation, net	(360)	(307)
Other, net	(4,686)	(4,841)
Net cash provided by operating activities	51,210	62,449
Cash flows from investing activities:
Capital expenditures	(40,778)	(14,428)
Contributions to equity method investees	0	(4,936)
Other, net	(221)	(361)
Net cash provided by (used in) investing activities	(40,999)	(19,725)
Cash flows from financing activities:
Distributions to unitholders	(45,053)	(44,452)
Borrowings under Revolving Credit Facility	50,000	72,000
Repayments under Revolving Credit Facility	(10,000)	(245,000)
Debt issuance costs	(4)	(6,825)
Payment of redemption and call premiums on senior notes	0	(17,913)
Proceeds from ATM Program common unit issuances, net of costs	0	367
Contribution from General Partner	0	113
Issuance of senior notes	0	500,000
Tender and redemption of senior notes	0	(300,000)
Other, net	(3,218)	(2,157)
Net cash provided by (used in) financing activities	(8,275)	(43,867)
Net change in cash and cash equivalents	1,936	(1,143)
Cash and cash equivalents, beginning of period	1,430	7,428
Cash and cash equivalents, end of period	3,366	6,285
Supplemental cash flow disclosures:
Cash interest paid	12,207	28,040
Less capitalized interest	1,222	468
Interest paid (net of capitalized interest)	10,985	27,572
Noncash investing and financing activities
Capital expenditures in trade accounts payable (period end accruals)	19,943	13,977
Capital expenditures relating to contributions in aid of construction for Topic 606 day 1 adoption	$ 33,123	$ 0