UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 4,449	$ (29,435)
Adjustments to reconcile net income (loss) to net cash provided by operating activities -
Depreciation, depletion and amortization	69,506	66,286
Amortization and write-off of debt issuance costs and premium	2,034	3,210
Payments received under previously owned direct financing leases	0	17,500
Equity in earnings of investments in equity investees	(12,444)	(20,660)
Cash distributions of earnings of equity investees	12,846	19,929
Non-cash effect of long-term incentive compensation plans	3,061	1,560
Deferred and other tax liabilities	179	72
Unrealized losses (gains) on derivative transactions	(1,903)	17,599
Other, net	5,686	6,160
Net changes in components of operating assets and liabilities (Note 14)	(29,169)	(5,062)
Net cash provided by operating activities	54,245	77,159
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(80,199)	(39,388)
Cash distributions received from equity investees - return of investment	6,008	9,314
Investments in equity investees	(1,323)	0
Proceeds from asset sales	0	23
Net cash used in investing activities	(75,514)	(30,051)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	181,700	212,000
Repayments on senior secured credit facility	(135,900)	(156,700)
Net proceeds from issuance of preferred units (Note 10)	0	17,738
Repayment of senior unsecured notes (Note 9)	0	(80,859)
Debt issuance costs	0	(1,916)
Contributions from noncontrolling interests	822	236
Distributions to noncontrolling interests	(5,202)	0
Distributions to common unitholders	(18,387)	(18,387)
Distributions to preferred unitholders	(18,684)	(18,684)
Other, net	6,480	6,233
Net cash provided by (used in) financing activities	10,829	(40,339)
Net increase (decrease) in cash and cash equivalents and restricted cash	(10,440)	6,769
Cash and cash equivalents and restricted cash at beginning of period	24,992	27,018
Cash and cash equivalents and restricted cash at end of period	$ 14,552	$ 33,787