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Property (Narrative) (Details)
$ in Thousands
3 Months Ended
Feb. 12, 2016
USD ($)
center
Mar. 31, 2016
USD ($)
property
Mar. 31, 2015
USD ($)
Business Acquisition [Line Items]      
Number of centers sold 1 3  
Proceeds from sale and disposition of property   $ 108,400  
Gain on sale of property   45,157 $ 22,522
Investment in new development   $ 6,200  
Business Combination Achieved in Stages [Member]      
Business Acquisition [Line Items]      
Property acquired $ 58,665