Investments in Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Investments in Joint Ventures [Abstract]
Total assets		$ 703,000		$ 715,900
Total third-party debt		513,400		514,500
Total equity		173,200		$ 174,500
Total revenues		31,100	$ 30,000
Net income		3,700	3,800
Equity in income (1)	[1]	$ 1,829	$ 1,817

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