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Summary of Significant Accounting Policies (Real Estate Investments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 06, 2017
Oct. 13, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of Real Estate Investments [Abstract]          
Land     $ 13,262 $ 13,262  
Buildings and improvements     43,074 42,951  
Total real estate investment     56,336 56,213  
Gain on sale of real estate investments     0 6,903 $ 10,419
Operating Leases, Future Minimum Payments Receivable [Abstract]          
2017     4,432    
2018     4,513    
2019     2,644    
2020     1,184    
2021     1,198    
Thereafter     $ 5,565    
CA Undeveloped Land          
Components of Real Estate Investments [Abstract]          
Proceeds from sale of real estate held-for-investment $ 1,350        
Gain on sale of real estate investments 580        
Selling expense 14        
Arizona Warehouse Building          
Components of Real Estate Investments [Abstract]          
Proceeds from sale of real estate held-for-investment   $ 20,000      
Gain on sale of real estate investments   9,981      
Selling expense   $ 112      
Minimum [Member]          
Components of Real Estate Investments [Abstract]          
Estimated useful life     7 years    
Maximum [Member]          
Components of Real Estate Investments [Abstract]          
Estimated useful life     39 years    
Land and Building [Member]          
Assets Leased or Available for Lease [Abstract]          
Assets leased or available for lease     $ 56,090 $ 55,966  
444 West Santa Clara Street, L.P. [Member]          
Components of Real Estate Investments [Abstract]          
Limited partership interest percentage     70.00%    
444 West Santa Clara Street, L.P. [Member] | 444 West Santa Clara Street          
Components of Real Estate Investments [Abstract]          
Proceeds from sale of real estate held-for-investment 11,000        
Gain on sale of real estate investments 6,323        
Selling expense 1,157        
Parent [Member] | 444 West Santa Clara Street          
Components of Real Estate Investments [Abstract]          
Gain on sale of real estate investments 4,427        
Noncontrolling Interest [Member] | 444 West Santa Clara Street          
Components of Real Estate Investments [Abstract]          
Gain on sale of real estate investments $ 1,896