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Property (Narrative) (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Feb. 12, 2016
USD ($)
center
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]        
Number of centers sold 1 3    
Proceeds from sale and disposition of property   $ 110,400    
Gain on sale of property   $ 46,190 $ 30,685 $ 1,000
Number of acquired centers | property   1    
Gross acquisition purchase price   $ 93,200    
Investment in new development   $ 16,500    
Business Combination Achieved in Stages [Member]        
Business Acquisition [Line Items]        
Number of acquired centers | center 2      
Property acquired $ 58,665