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Merger With Tier REIT, Inc. - Narrative (Details)
shares in Millions
3 Months Ended 9 Months Ended
Jun. 14, 2019
USD ($)
shares
Mar. 25, 2019
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]            
Reverse stock split ratio 0.25          
TIER            
Business Acquisition [Line Items]            
Stock conversion ratio   2.98        
Fair value of assets acquired and liabilities assumed $ 1,600,000,000          
Acquisition expenses     $ 0 $ 1,000,000.0 $ 428,000 $ 50,900,000
TIER | Rental Property Revenues            
Business Acquisition [Line Items]            
Amount reported in consolidated revenue     $ 51,500,000 $ 52,100,000 $ 154,100,000 $ 61,700,000
Former TIER Common Stockholders            
Business Acquisition [Line Items]            
Number of shares issued | shares 166