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Principal Activity and Significant Accounting Policies - Real Estate Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Real Estate Investments      
Amortization expense $ 380 $ 512  
Amortization expense of below market lease 56 67  
Depreciation expense 4,868 5,012 $ 5,012
Loss on impairment of property $ 0 0  
Building and improvements      
Real Estate Investments      
Estimated useful life 40 years    
Furniture and fixtures | Minimum      
Real Estate Investments      
Estimated useful life 5 years    
Furniture and fixtures | Maximum      
Real Estate Investments      
Estimated useful life 9 years    
In-place leases      
Real Estate Investments      
Amortization expense $ 341 429  
Above-market leases      
Real Estate Investments      
Amortization expense $ 52 $ 54