Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 49,748	$ 38,188
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	30,723	30,609
Amortization of debt issuance costs and premium	2,128	1,784
Amortization of unearned income and initial direct costs on direct financing leases	(8,136)	(8,456)
Payments received under direct financing leases	10,631	10,926
Equity in earnings of investments in equity investees	(9,559)	(4,539)
Cash distributions of earnings of equity investees	15,475	10,715
Non-cash effect of equity-based compensation plans	8,710	1,617
Deferred and other tax liabilities	(536)	(439)
Unrealized gains on derivative transactions	(2,023)	(1,176)
Other, net	93	126
Net changes in components of operating assets and liabilities, (See Note 10)	(1,468)	19,924
Net cash provided by operating activities	95,786	99,279
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(107,166)	(80,378)
Cash distributions received from equity investees - return of investment	5,539	7,309
Investments in equity investees	(66,207)	(51,431)
Acquisitions	0	(205,576)
Proceeds from asset sales	626	654
Other, net	171	(915)
Net cash used in investing activities	(167,037)	(330,337)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	668,500	700,700
Repayments on senior secured credit facility	(849,400)	(665,000)
Proceeds from issuance of senior unsecured notes, including premium	350,000	101,000
Debt issuance costs	(8,157)	(2,690)
Issuance of common units for cash, net	0	169,421
Distributions to common unitholders	(79,795)	(67,445)
Other, net	(2,511)	(703)
Net cash provided by financing activities	78,637	235,283
Net increase in cash and cash equivalents	7,386	4,225
Cash and cash equivalents at beginning of period	11,282	10,817
Cash and cash equivalents at end of period	$ 18,668	$ 15,042