Investments in Unconsolidated Real Estate Joint Ventures (Condensed Statement Of Operations In Unconsolidated Real Estate Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Total revenues	$ 45,624	$ 25,535	$ 38,615	$ 21,709	$ 27,273	$ 21,906	$ 22,650	$ 20,816	$ 131,483	$ 92,645	$ 48,658
Total costs and expenses	(40,146)	(32,439)	(22,128)	(25,859)	(35,325)	(30,981)	(23,710)	(25,434)	(120,572)	(115,450)	(14,082)
Net income (loss)	$ 13,291	$ 3,039	$ 6,320	$ 877	$ (2,180)	$ (1,964)	$ 7,157	$ 1,291	23,527	4,304	$ 47,660
Equity Method Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenues									4,147	635
Total costs and expenses									(8,594)	(1,841)
Net income (loss)									$ (4,447)	$ (1,206)