Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 7,898	$ 26,938
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion and amortization	75,255	56,112
Amortization and writeoff of debt issuance costs and discount	4,161	2,582
Amortization Of Unearned Income And Initial Direct Costs On Direct Financing Leases	(3,330)	(3,500)
Payments received under direct financing leases	5,167	5,167
Equity in earnings of investments in equity investees	(10,572)	(11,335)
Cash distributions of earnings of equity investees	10,352	11,542
Non-cash effect of equity-based compensation plans	(136)	864
Deferred and other tax liabilities	225	205
Unrealized loss on derivative transactions	2,642	142
Other, net	(1,552)	1,391
Net changes in components of operating assets and liabilities (Note 14)	(3,782)	(29,068)
Net cash provided by operating activities	86,328	61,040
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(66,051)	(61,292)
Cash distributions received from equity investees - return of investment	9,277	9,083
Contributions in aid of construction costs	0	124
Proceeds from asset sales	6	1,234
Net cash used in investing activities	(56,768)	(50,851)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	333,800	216,700
Repayments on senior secured credit facility	(154,000)	(284,900)
Repayment of senior unsecured notes	(145,170)	0
Debt issuance costs	(159)	0
Issuance of common units for cash, net	0	140,968
Contributions from noncontrolling interest	400	0
Distributions to common unitholders	(62,515)	(83,765)
Other, net	5,135	4,552
Net cash used in financing activities	(22,509)	(6,445)
Net increase in cash and cash equivalents	7,051	3,744
Cash and cash equivalents at beginning of period	9,041	7,029
Cash and cash equivalents at end of period	$ 16,092	$ 10,773