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Investment in Real Estate - Other 2016 Acquisitions and Disposition Narrative (Details)
ft² in Thousands, $ in Thousands
5 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
ft²
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
ft²
property
Jul. 21, 2016
Real Estate Acquisition [Line Items]          
Proceeds from sale of interest in joint venture $ 51,600        
Proceeds from sale of interest in real estate held for investment, compensation $ 194        
Gains on sale of investment in real estate   $ 0 $ 0 $ 14,327  
Joint venture, contributions received     $ 284,000    
Office          
Real Estate Acquisition [Line Items]          
Number of properties acquired | property     1    
Sherman Oaks | Office          
Real Estate Acquisition [Line Items]          
Gains on sale of investment in real estate       $ 12,700  
Building square footage | ft² 168     168  
Real estate held for sale, carrying value $ 42,800     $ 42,800  
Contract price in real estate transaction       56,700  
Sales of real estate, transaction costs       $ 1,200  
Investor          
Real Estate Acquisition [Line Items]          
Joint venture, contributions received $ 139,800        
Investors ownership percentage in joint venture       80.00%  
Consolidated JV          
Real Estate Acquisition [Line Items]          
Percentage of equity contributed in joint venture 20.00%     20.00% 55.00%
Percentage of joint venture sold 35.00%     35.00%  
Gains on sale of investment in real estate       $ 587  
Consolidated JV | Office          
Real Estate Acquisition [Line Items]          
Number of properties acquired | property     3 2  
Consolidated JV | Secured Debt | Term Loan With Maturity Date of July 21, 2019          
Real Estate Acquisition [Line Items]          
Proceeds from non-recourse loan       $ 146,000  
Debt instrument, term       3 years  
Variable interest rate       LIBOR  
Consolidated JV | Secured Debt | Term Loan With Maturity Date of July 21, 2019 | LIBOR          
Real Estate Acquisition [Line Items]          
Basis spread on variable rate       1.55%