Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 58,778	$ 31,880
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	102,535	55,330
Amortization of debt issuance costs and discount or premium	4,992	6,526
Amortization of unearned income and initial direct costs on direct financing leases	(7,274)	(7,566)
Payments received under direct financing leases	10,333	10,333
Equity in earnings of investments in equity investees	(22,874)	(34,180)
Cash distributions of earnings of equity investees	32,778	38,811
Non-cash effect of equity-based compensation plans	4,255	4,744
Deferred and other tax liabilities	1,409	1,250
Unrealized loss on derivative transactions	1,313	1,309
Other, net	7,668	(2,296)
Net changes in components of operating assets and liabilities (Note 12)	(90,241)	(35,039)
Net cash provided by operating activities	103,672	71,102
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(247,416)	(240,646)
Cash distributions received from equity investees - return of investment	11,851	11,490
Investments in equity investees	(1,135)	(1,750)
Acquisitions	(25,394)	0
Proceeds from Contribution in Aid of Construction	8,940	0
Proceeds from asset sales	3,183	2,228
Other, net	107	(729)
Net cash used in investing activities	(249,864)	(229,407)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	631,900	550,500
Repayments on senior secured credit facility	(341,100)	(515,700)
Proceeds from issuance of senior unsecured notes	0	400,000
Repayment of senior unsecured notes	0	(350,000)
Debt issuance costs	(1,539)	(8,418)
Issuance of common units for cash, net	0	197,722
Distributions to common unitholders	(146,021)	(117,316)
Other, net	607	774
Net cash provided by financing activities	143,847	157,562
Net increase in cash and cash equivalents	(2,345)	(743)
Cash and cash equivalents at beginning of period	10,895	9,462
Cash and cash equivalents at end of period	$ 8,550	$ 8,719