Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 38,188	$ 24,388
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	30,392	28,156
Amortization of debt issuance costs and premium	1,784	1,310
Amortization of unearned income and initial direct costs on direct financing leases	(8,456)	(8,672)
Payments received under direct financing leases	10,926	10,926
Equity in earnings of investments in equity investees	(4,539)	(3,789)
Cash distributions of earnings of equity investees	10,715	5,917
Non-cash effect of equity-based compensation plans	1,617	(757)
Deferred and other tax liabilities	(439)	21
Unrealized gains on derivative transactions	(1,176)	(15)
Other, net	343	972
Net changes in components of operating assets and liabilities, (See Note 11)	19,924	(49,035)
Net cash provided by (used in) operating activities	99,279	9,422
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(80,378)	(9,328)
Cash distributions received from equity investees - return of investment	7,309	6,096
Investments in equity investees	(51,431)	(194)
Acquisitions	(205,576)	0
Other, net	(261)	1,041
Net cash used in investing activities	(330,337)	(2,385)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	700,700	267,900
Repayments on senior secured credit facility	(665,000)	(221,900)
Proceeds from issuance of senior unsecured notes, including premium	101,000	0
Senior unsecured notes issuance costs	(2,690)	0
Issuance of common units for cash, net	169,421	0
Distributions to common unitholders	(67,445)	(52,189)
Other, net	(703)	(1,176)
Net cash provided by (used in) financing activities	235,283	(7,365)
Net increase (decrease) in cash and cash equivalents	4,225	(328)
Cash and cash equivalents at beginning of period	10,817	5,762
Cash and cash equivalents at end of period	$ 15,042	$ 5,434