Annual report pursuant to Section 13 and 15(d)

Orion Office REIT, Fair Value Measures - Fair Value of Financial Instruments (Details)

v3.22.1
Orion Office REIT, Fair Value Measures - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 620,000 $ 36,476
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 620,000 37,095
Level 2 | Bridge facility, net | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 355,000 0
Level 2 | Bridge facility, net | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 355,000 0
Level 2 | Credit facility term loan, net | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 175,000 0
Level 2 | Credit facility term loan, net | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 175,000 0
Level 2 | Credit facility revolver | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 90,000 0
Level 2 | Credit facility revolver | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 90,000 0
Level 2 | Mortgages payable assumed in connection with acquisitions | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 0 36,476
Level 2 | Mortgages payable assumed in connection with acquisitions | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 0 $ 37,095