Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 86,109	$ 96,319	$ 51,249
Adjustments to reconcile net income to net cash provided by operating activities -
Amortization and write-off of debt issuance costs and premium	4,339	4,037	2,940
Amortization of unearned income and initial direct costs on direct financing leases	(16,152)	(16,788)	(17,237)
Payments received under direct financing leases	21,262	21,804	21,852
Equity in earnings of investments in equity investees	(22,675)	(14,345)	(3,347)
Cash distributions of earnings of equity investees	34,132	23,900	8,592
Non-cash effect of equity-based compensation plans	12,473	7,197	(15)
Deferred and other tax benefits	(152)	(9,222)	(2,075)
Unrealized losses on derivative transactions	1,313	86	1,002
Other, net	(873)	2,085	87
Net changes in components of operating assets and liabilities, net of acquisitions (See Note 14)	(46,186)	13,065	(66,931)
Net cash provided by operating activities	138,386	189,304	58,307
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(343,119)	(146,456)	(27,992)
Cash distributions received from equity investees—return of investment	12,432	14,909	11,436
Investments in equity investees	(94,551)	(63,749)	0
Acquisitions	(230,880)	(205,576)	(163,673)
Proceeds from asset sales and discontinued operations	1,910	773	6,424
Other, net	(1,622)	(1,508)	1,508
Net cash used in investing activities	(655,830)	(401,607)	(172,297)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	1,593,300	1,674,400	777,600
Repayments on senior secured credit facility	(1,510,500)	(1,583,700)	(728,300)
Proceeds from issuance of senior unsecured notes, including premium	350,000	101,000	0
Debt issuance costs	(8,157)	(7,105)	(3,018)
Issuance of common units for cash, net	263,574	169,421	184,969
Distributions to common unitholders	(168,441)	(142,383)	(112,844)
Other, net	(4,748)	1,135	638
Net cash provided by financing activities	515,028	212,768	119,045
Net (decrease) increase in cash and cash equivalents	(2,416)	465	5,055
Cash and cash equivalents at beginning of period	11,282	10,817	5,762
Cash and cash equivalents at end of period	8,866	11,282	10,817
DepreciationDepletionAndAmortizationIncludingDiscOps	$ 64,796	$ 61,166	$ 62,190