Business Segment Information (Reconciliation Of Segment Margin To (Loss) Income from Continuing Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting [Abstract]
Segment margin	$ 94,790	$ 64,824	$ 254,822	$ 207,331
Corporate general and administrative expenses	(12,865)	(11,113)	(37,715)	(32,255)
Depreciation and amortization	(25,148)	(16,066)	(64,919)	(46,780)
Interest Income (Expense), Net	(20,441)	(12,587)	(47,314)	(36,283)
Distributable cash from equity investees in excess of equity in earnings	(6,741)	(5,204)	(20,326)	(16,659)
Non-cash items not included in segment margin	1,653	507	1,935	(2,828)
Cash payments from direct financing leases in excess of earnings	(1,404)	(1,291)	(4,113)	(3,786)
Income tax benefit (expense)	(731)	(596)	(2,334)	(510)
Discontinued Operations for Segment Margin Reconciliation	0	(508)	0	(949)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	29,113	17,966	80,036	67,281
Income from continuing operations before income taxes	$ 29,844	$ 18,562	$ 82,370	$ 67,791