Investments In Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) (USD $)	1 Months Ended	3 Months Ended
	Jan. 31, 2015	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Investments In Joint Ventures [Abstract]
Total assets		$ 751,600,000				$ 757,800,000
Total third-party debt		527,300,000				523,600,000
Total equity		203,900,000				203,300,000
Total revenues (1)		27,500,000	[1]	25,100,000	[1]
Gain On Sale Of Joint Venture Operating Property Net Of Tax		0		18,500,000
Net income		2,700,000		20,000,000
Equity in income (2)		1,382,000	[2]	4,290,000	[2]
Schedule of Equity Method Investments [Line Items]
Number of operating properties sold	2
Sale of two operating properties within the funds in 2014 [Member]
Schedule of Equity Method Investments [Line Items]
Revenues from discontinued operations attributable to unconsolidated joint venture				$ 1,100,000
Number of operating properties sold				2

[1] Excludes approximately $1.1 million for the three months ended March 31, 2014, related to the sale of two operating properties by the funds during the first quarter of 2014.

[2] Equity in income excludes our ownership interest of fee income from various services provided by us to the funds.