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Real Estate - Dispositions (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
property
Real Estate [Line Items]    
Net proceeds from sales of real estate $ 7,493 $ 58,529
Impairment of assets 1,708 3,851
Income (impairment) from sales of real estate 0 9,407
Operating Properties    
Real Estate [Line Items]    
Net proceeds from sales of real estate 7,500 58,500
Impairment of assets $ 1,700  
Income (impairment) from sales of real estate   $ 9,400
Number of properties sold | property   2