Noncontrolling Interests (Effect Of Changes In Ownership Interest In Subsidiaries On Consolidated Equity)(Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Noncontrolling Interest [Abstract]
Net Income Adjusted for Noncontrolling Interests	$ 51,901	$ 43,401	$ 194,791	$ 127,077
Transfers from the noncontrolling interests:
Increase in equity for operating partnership units			0	111
Change from net income adjusted for noncontrolling interests and transfers from the noncontrolling interests			$ 194,791	$ 127,188