UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income (loss)	$ 86,112	$ (48,381)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	89,505	83,030
Noncash lease expense	1,925	2,299
Amortization of debt issuance costs	4,870	4,719
Unit-based and noncash compensation	6,191	5,370
(Income) loss from equity method investees	(7,146)	1,197
Distributions from equity method investees	19,859	28,008
Gain on asset sales, net	(270)	(1,595)
Gain on early extinguishment of debt	(78,925)	0
Gain on fair value of warrants	(838)	0
Long-lived asset impairment	4,475	45,021
Goodwill impairment	0	16,211
Changes in operating assets and liabilities:
Accounts receivable	20,922	8,363
Trade accounts payable	470	820
Accrued expenses	(1,078)	(11,965)
Deferred revenue, net	7,379	1,910
Ad valorem taxes payable	(1,546)	(2,061)
Accrued interest	2,680	3,065
Accrued environmental remediation, net	(1,368)	(2,025)
Other, net	(6,410)	(6,369)
Net cash provided by operating activities	146,807	127,617
Cash flows from investing activities:
Capital expenditures	(35,312)	(151,663)
Proceeds from asset sale (net of cash of $1,475 for the period ended September 30, 2019)	0	90,111
Distribution from equity method investment	0	7,252
Investment in equity method investee	(92,072)	(11,330)
Other, net	2,486	343
Net cash used in investing activities	(124,898)	(65,287)
Cash flows from financing activities:
Net cash distributions to noncontrolling interest SMLP unitholders	(6,037)	(55,029)
Series A Preferred Unit distributions	0	(14,250)
Net cash distributions to Energy Capital Partners	0	(68,984)
Borrowings under Revolving Credit Facility	165,500	265,000
Repayments on Revolving Credit Facility	(34,000)	(131,000)
Repayments on SMPH Term Loan	(6,300)	(59,500)
Proceeds from issuance of Subsidiary Series A preferred units, net of issuance costs	48,710	0
Borrowings under ECP Loans (Note 8)	35,000	0
Repayment of ECP Loans (Note 8)	(35,000)	0
Purchase of common units in GP Buy-In Transaction	(41,778)	0
Debt issuance costs	(835)	(584)
Proceeds from asset sale	288	0
Other, net	(2,527)	(3,930)
Net cash provided by (used in) financing activities	(8,535)	(68,277)
Net change in cash, cash equivalents and restricted cash	13,374	(5,947)
Cash, cash equivalents and restricted cash, beginning of period	36,922	16,173
Cash, cash equivalents and restricted cash, end of period	50,296	10,226
Open Market Repurchases
Cash flows from financing activities:
Repurchases of 2022 and 2025 Senior Notes (Note 8)	(82,844)	0
Tender Offers
Cash flows from financing activities:
Repurchases of 2022 and 2025 Senior Notes (Note 8)	$ (48,712)	$ 0