Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 29,775	$ 22,846
DepreciationDepletionAndAmortizationIncludingDiscOps	19,280	15,053
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	19,280	15,049
Amortization of debt issuance costs and premium	1,104	1,022
Amortization of unearned income and initial direct costs on direct financing leases	(3,977)	(4,083)
Payments received under direct financing leases	5,315	5,315
Equity in earnings of investments in equity investees	(7,818)	(3,936)
Cash distributions of earnings of equity investees	9,944	6,047
Non-cash effect of equity-based compensation plans	2,886	7,021
Deferred and other tax liabilities	341	(323)
Unrealized gains on derivative transactions	(3,911)	(52)
Other, net	231	71
Net changes in components of operating assets and liabilities, (Note 11)	52,918	(10,165)
Net cash provided by operating activities	106,088	38,816
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(104,254)	(47,151)
Cash distributions received from equity investees - return of investment	2,636	3,583
Investments in equity investees	(10,709)	(64,534)
Proceeds from asset sales	72	332
Other, net	(1,270)	755
Net cash used in investing activities	(113,525)	(107,015)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	249,900	386,400
Repayments on senior secured credit facility	(192,200)	(615,400)
Proceeds from issuance of senior unsecured notes, including premium	0	350,000
Debt issuance costs	0	(8,157)
Distributions to common unitholders	(47,453)	(39,390)
Other, net	0	(553)
Net cash provided by financing activities	10,247	72,900
Net increase in cash and cash equivalents	2,810	4,701
Cash and cash equivalents at beginning of period	8,866	11,282
Cash and cash equivalents at end of period	$ 11,676	$ 15,983