Business Segment Information (Reconciliation Of Segment Margin To (Loss) Income from Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Segment Reporting [Abstract]
Segment margin	$ 98,567	$ 82,681	$ 192,688		$ 160,032
Corporate general and administrative expenses	(13,953)	(13,789)	(26,252)		(24,850)
Depreciation and amortization	(28,205)	(20,491)	(55,330)		(39,771)
Interest Income (Expense), Net	(17,905)	(14,069)	(37,120)		(26,873)
Distributable cash from equity investees in excess of equity in earnings	(7,038)	(7,808)	(17,421)	[1]	(13,585)
Non-cash items not included in segment margin	1,771	(3,043)	(843)		282
Cash payments from direct financing leases in excess of earnings	(1,405)	(1,371)	(2,767)		(2,709)
Gains (Losses) on Extinguishment of Debt	(19,225)	0	(19,225)		0
Income tax benefit (expense)	(942)	(962)	(1,850)		(1,603)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	11,665	21,148	31,880		50,923
Income from continuing operations before income taxes	$ 12,607	$ 22,110	$ 33,730		$ 52,526

[1] Includes distributions attributable to the quarter and received during or promptly following such quarter.