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Real Estate Investments - Properties held-for-sale (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
$ / item
property
Dec. 31, 2018
USD ($)
Real estate investments    
Accumulated depreciation $ 322,535 $ 312,959
ILF | Properties held-for-sale | Texas    
Real estate investments    
Number of properties | property 1  
Gross Investment $ 5,746  
Accumulated depreciation $ 1,916  
Number of beds/units | $ / item 140