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Real Estate (Dispositions) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income from sales of real estate $ 10,458 $ 21,156  
Net proceeds from sales of real estate 35,680 147,635  
Payments for repurchase of redeemable noncontrolling interest     $ 6,400
Residential Condominiums      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of other real estate 19,700 49,000  
Income from sales of real estate 4,900 17,600  
Net Lease Asset Two      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income from sales of real estate 4,900 3,600  
Proceeds from sale of property held-for-sale   4,900  
Net proceeds from sales of real estate 10,000    
Commercial Operating Properties      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income from sales of real estate 700    
Net proceeds from sales of real estate 5,900    
Operating Properties      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net proceeds from sales of real estate   $ 93,500  
Deferred gain on sale of property $ 5,300    
Net Lease Asset One      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Initial term of ground lease 99 years    
Lease incentive asset $ 38,100