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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
Aug. 14, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of Real Estate Investments [Abstract]            
Land       $ 13,262 $ 15,218  
Buildings and improvements       42,951 46,826  
Intangibles       0 149  
Total real estate investment       56,213 62,193  
Gain on sale of real estate investments       6,903 10,419 $ 1,886
Operating Leases, Future Minimum Payments Receivable [Abstract]            
2017       4,351    
2018       4,432    
2019       4,513    
2020       2,644    
2021       1,184    
Thereafter       $ 6,763    
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        
California Non-Utility Property Portfolio            
Components of Real Estate Investments [Abstract]            
Proceeds from sale of real estate held-for-investment     $ 2,015      
Gain on sale of real estate investments     1,886      
Selling expense     $ 91      
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       $ 55,966 $ 61,179  
Building and Building Improvements [Member] | Minimum [Member]            
Components of Real Estate Investments [Abstract]            
Estimated useful life       7 years    
Building and Building Improvements [Member] | Maximum [Member]            
Components of Real Estate Investments [Abstract]            
Estimated useful life       39 years    
Finite-Lived Intangible Assets [Member] | Minimum [Member]            
Components of Real Estate Investments [Abstract]            
Estimated useful life       7 years    
Finite-Lived Intangible Assets [Member] | Maximum [Member]            
Components of Real Estate Investments [Abstract]            
Estimated useful life       12 years    
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