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Transactions With Tier Reit, Inc. (Additional Information) (Details)
$ in Thousands, shares in Millions
12 Months Ended
Jun. 14, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]    
Reverse stock split ratio 0.25  
TIER    
Business Acquisition [Line Items]    
Stock conversation ratio 2.98  
Fair value of assets acquired and liabilities assumed $ 1,600,000  
Acquisition expenses   $ 52,900
TIER | Rental property revenues    
Business Acquisition [Line Items]    
Amount reported in consolidated revenue   113,100
Amount reported in consolidated net income   $ 291
TIER REIT, Inc.    
Business Acquisition [Line Items]    
Number of shares issued | shares 166