UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 57,599	$ 18,769
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion and amortization	156,991	152,935
Amortization and write-off of debt issuance costs and discount	5,370	6,820
Amortization of unearned income and initial direct costs on direct financing leases	(6,227)	(6,615)
Payments received under direct financing leases	10,334	10,334
Equity in earnings of investments in equity investees	(28,043)	(18,896)
Cash distributions of earnings of equity investees	27,735	20,162
Non-cash effect of long-term incentive compensation plans	3,822	1,662
Deferred and other tax liabilities	335	331
Unrealized loss on derivative transactions	13,304	3,269
Other, net	(7,703)	(3,800)
Net changes in components of operating assets and liabilities (Note 14)	(37,907)	(34,155)
Net cash provided by operating activities	195,610	150,816
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(68,666)	(110,970)
Cash distributions received from equity investees - return of investment	10,811	17,828
Investments in equity investees	0	(395)
Proceeds from asset sales	861	1,192
Net cash used in investing activities	(56,994)	(92,345)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	387,000	543,100
Repayments on senior secured credit facility	(390,100)	(336,000)
Repayment of senior unsecured notes	0	(145,170)
Debt issuance costs	0	(224)
Contributions from noncontrolling interests	1,230	1,320
Distributions to common unitholders	(134,838)	(126,257)
Distributions to preferred unitholders	(6,138)	0
Other, net	3,509	3,565
Net cash used in financing activities	(139,337)	(59,666)
Net decrease in cash and cash equivalents	(721)	(1,195)
Cash and cash equivalents at beginning of period	10,300	9,041
Cash and cash equivalents at end of period	$ 9,579	$ 7,846