Noncontrolling Interests (Effect Of Changes In Ownership Interest In Subsidiaries) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Noncontrolling Interests [Abstract]
Net income attributable to common shareholders	$ 70,720	$ 30,703	$ 206,368	$ 141,224
Increase (decrease) in equity for conversion of operating partnership units			71	(448)
Decrease in APIC for purchase of remaining noncontrolling ownership interest in consolidated JV			0	(13,285)
Change in common equity and net transfers from non-controlling interests			$ 206,439	$ 127,491