Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 60,518	$ 58,778
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	112,721	102,535
Non-cash provision for leased items no longer in use	12,589	0
Gain (Loss) on Disposition of Assets	(26,684)	0
Amortization of debt issuance costs and discount	5,260	4,992
Amortization of unearned income and initial direct costs on direct financing leases	(6,958)	(7,274)
Payments received under direct financing leases	10,334	10,333
Equity in earnings of investments in equity investees	(21,761)	(22,874)
Cash distributions of earnings of equity investees	29,868	32,778
Non-cash effect of equity-based compensation plans	(1,457)	4,255
Deferred and other tax liabilities	358	1,409
Unrealized loss on derivative transactions	561	1,313
Other, net	292	7,668
Net changes in components of operating assets and liabilities (Note 11)	8,313	(90,241)
Net cash provided by operating activities	183,954	103,672
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(126,580)	(247,416)
Cash distributions received from equity investees - return of investment	10,323	11,851
Investments in equity investees	0	(1,135)
Acquisitions	(759)	(25,394)
Proceeds from Contribution in Aid of Construction	124	8,940
Proceeds from asset sales	38,237	3,183
Other, net	0	107
Net cash used in investing activities	(78,655)	(249,864)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	410,700	631,900
Repayments on senior secured credit facility	(477,900)	(341,100)
Payments of Debt Issuance Costs	7,536	1,539
Issuance of common units for cash, net	140,537	0
Contributions from noncontrolling interest	725	0
Distributions to common unitholders	(171,993)	(146,021)
Other, net	3,216	607
Net cash provided by financing activities	(102,251)	143,847
Net increase in cash and cash equivalents	3,048	(2,345)
Cash and cash equivalents at beginning of period	7,029	10,895
Cash and cash equivalents at end of period	$ 10,077	$ 8,550