Investments in Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2014	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)		Dec. 31, 2014 USD ($)
Investments in Joint Ventures [Abstract]
Total assets		$ 753,800			$ 753,800			$ 757,800
Total third-party debt		529,300			529,300			523,600
Total equity		198,500			198,500			$ 203,300
Total revenues (1)		29,400	$ 27,300		85,200	$ 78,300	[1]
Gain On Sale Of Joint Venture Operating Property Net Of Tax		0	0		0	18,500
Net income		3,100	2,200		8,700	23,800
Equity in income (2)	[2]	$ 1,574	$ 863		$ 4,487	5,889
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
Number of operating properties sold				2

[1] Excludes approximately $1.1 million for the nine months ended September 30, 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.