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Other Investments - Net Lease Venture II (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2019
USD ($)
ft²
building
lease
May 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
lease
building
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]              
Equity interest (as a percent)         50.00%   50.00%
Commitment to provide loan to lessee $ 150,000,000.0            
Number of units to be built | building 3            
Acquisitions of real estate assets   $ 56,700,000       $ 0 $ 240,487,000
Net Lease Venture II              
Schedule of Equity Method Investments [Line Items]              
Equity interest (as a percent)       51.90%   51.90%  
Net Lease Venture II | The Properties Livermore CA              
Schedule of Equity Method Investments [Line Items]              
Number of properties | building 2   4        
Acquisitions of real estate assets $ 81,800,000   $ 31,200,000        
Percentage of acquired properties leased (as a percent) 100.00%   100.00%        
Number of leases | lease 2   4        
Area of properties (sq ft) | ft² 168,636            
Net Lease Venture II | Other income              
Schedule of Equity Method Investments [Line Items]              
Management fee revenue from related party       $ 400,000 $ 400,000 $ 1,100,000 $ 1,100,000
Net Lease Venture II | Other income | Management Fees              
Schedule of Equity Method Investments [Line Items]              
Amount of loan funded       $ 81,600,000   $ 81,600,000  
Net Lease Venture II | Other income | Master Lease | Management Fees              
Schedule of Equity Method Investments [Line Items]              
Term of master lease 25 years