UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 75,406	$ 17,135
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion and amortization	240,513	244,811
Gain on sale of assets	0	(3,363)
Amortization and write-off of debt issuance costs and discount	8,065	9,489
Amortization of unearned income and initial direct costs on direct financing leases	(9,271)	(9,847)
Payments received under direct financing leases	15,501	15,501
Equity in earnings of investments in equity investees	(39,873)	(28,388)
Cash distributions of earnings of equity investees	39,725	28,992
Non-cash effect of long-term incentive compensation plans	6,298	3,240
Deferred and other tax liabilities	296	380
Unrealized loss on derivative transactions	4,231	1,285
Other, net	(3,518)	999
Net changes in components of operating assets and liabilities (Note 14)	(5,644)	27,330
Net cash provided by operating activities	331,729	307,564
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(109,598)	(152,868)
Cash distributions received from equity investees - return of investment	18,333	26,042
Investments in equity investees	0	(2,960)
Proceeds from asset sales	890	36,859
Net cash used in investing activities	(90,375)	(92,927)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	597,500	759,800
Repayments on senior secured credit facility	(620,600)	(638,300)
Net proceeds from issuance of preferred units (Note 10)	49,400	0
Repayment of senior unsecured notes	0	(145,170)
Debt issuance costs	0	(242)
Contributions from noncontrolling interests	3,605	1,980
Distributions to common unitholders	(202,256)	(191,224)
Distributions to preferred unitholders	(24,822)	0
Other, net	2,128	1,356
Net cash used in financing activities	(195,045)	(211,800)
Net increase in cash and cash equivalents	46,309	2,837
Cash and cash equivalents at beginning of period	10,300	9,041
Cash and cash equivalents at end of period	$ 56,609	$ 11,878