Equity (Net Income Attributable To Common Stockholders And Transfers (To) From Noncontrolling Interests) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stockholders' Equity Note [Abstract]
Net income attributable to common stockholders	$ 13,363	$ 13,635	$ 26,339	$ 25,717
Increase in common stockholders paid-in capital for redemption of operating partnership units	6,106	337	20,479	18,516
Change from net income attributable to common stockholders and transfers from noncontrolling interest	$ 19,469	$ 13,972	$ 46,818	$ 44,233