Quarterly report pursuant to Section 13 or 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
Mar. 31, 2022
Dec. 31, 2021
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 621,000 $ 620,000
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 625,166 620,000
Level 2 | Bridge facility, net | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 0 355,000
Level 2 | Bridge facility, net | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 0 355,000
Level 2 | Mortgages payable, net | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 355,000 0
Level 2 | Mortgages payable, net | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 359,166 0
Level 2 | Credit facility term loan, net | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 175,000 175,000
Level 2 | Credit facility term loan, net | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 175,000 175,000
Level 2 | Credit facility revolver | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 91,000 90,000
Level 2 | Credit facility revolver | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 91,000 $ 90,000