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Principal Activity and Significant Accounting Policies - Real Estate Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Real Estate Investments    
Amortization expense $ 570 $ 641
Amortization expense of below market lease 70 73
Depreciation expense 4,767 4,705
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 $ 368 391
Above-market leases    
Real Estate Investments    
Amortization expense $ 56 $ 57