Investments in Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)		Dec. 31, 2014 USD ($)
Investments in Joint Ventures [Abstract]
Total assets		$ 754,200			$ 754,200			$ 757,800
Total third-party debt		528,600			528,600			523,600
Total equity		201,600			201,600			$ 203,300
Total revenues (1)		28,300	$ 25,900		55,800	$ 51,000	[1]
Gain On Sale Of Joint Venture Operating Property Net Of Tax		0	0		0	18,500
Net income		2,900	1,600		5,600	21,700
Equity in income (2)	[2]	$ 1,531	$ 736		$ 2,913	5,026
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 six months ended June 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.