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Property (Schedule Of Property) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Real Estate [Abstract]    
Land $ 1,112,752 $ 1,107,072
Land held for development 73,996 82,953
Land under development 48,220 51,761
Buildings and improvements 3,432,320 3,489,685
Construction in-progress 80,059 57,674
Total $ 4,747,347 $ 4,789,145