Segment Reporting (Reconciliation Of Segment Profit To Net Income Attributable To Common Stockholders) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting [Abstract]
Total profit from all segments	$ 100,387	$ 99,140
General and administrative expense	(6,811)	(7,096)
Depreciation and amortization	(50,199)	(46,024)
Other income	4,287	777
Other expenses	(1,453)	(367)
Income, including depreciation, from unconsolidated real estate funds	1,113	1,189
Interest expense	(31,838)	(32,832)
Acquisition-related expenses	(28)	(175)
Net income	15,458	14,612
Less: Net income attributable to noncontrolling interests	(2,482)	(2,530)
Net income attributable to common stockholders	$ 12,976	$ 12,082