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)	$ (319,166)	$ 75,406
Adjustments to reconcile net income (loss) to net cash provided by operating activities -
Depreciation, depletion and amortization	222,210	240,513
Asset Impairment Charges	280,826	0
Amortization and write-off of debt issuance costs and discount	17,515	8,065
Amortization of unearned income and initial direct costs on direct financing leases	(8,217)	(9,271)
Payments received under direct financing leases	56,837	15,501
Equity in earnings of investments in equity investees	(41,216)	(39,873)
Cash distributions of earnings of equity investees	40,773	39,725
Non-cash effect of long-term incentive compensation plans	(2,806)	6,298
Deferred and other tax liabilities	25	296
Unrealized (gains) losses on derivative transactions	(19,582)	4,231
Cancellation of debt income	(20,534)	0
Other, net	16,817	(3,518)
Net changes in components of operating assets and liabilities (Note 14)	72,146	(5,644)
Net cash provided by operating activities	295,628	331,729
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(100,381)	(109,598)
Cash distributions received from equity investees - return of investment	14,943	18,333
Proceeds from asset sales	447	890
Net cash used in investing activities	(84,991)	(90,375)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	814,100	597,500
Repayments on senior secured credit facility	(788,600)	(620,600)
Proceeds from issuance of senior unsecured notes due 2028	750,000	0
Proceeds from issuance of preferred units	0	49,400
Repayment of senior unsecured notes	(827,031)	0
Debt issuance costs	(15,279)	0
Contributions from noncontrolling interests	2,163	3,605
Distributions to common unitholders	(104,192)	(202,256)
Distributions to preferred unitholders	(56,052)	(24,822)
Other, net	1,865	2,128
Net cash used in financing activities	(223,026)	(195,045)
Net increase (decrease) decrease in cash, restricted cash, and cash equivalents	(12,389)	46,309
Cash, restricted cash and cash equivalents at beginning of period	56,405	10,300
Cash, restricted cash and cash equivalents at end of period	$ 44,016	$ 56,609