Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.2.2
Orion Office REIT, Fair Value Measures - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Carrying Amount at September 30, 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 561,000 $ 620,000
Fair Value at September 30, 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 540,473 620,000
Level 2 | Bridge facility | Carrying Amount at September 30, 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 0 355,000
Level 2 | Bridge facility | Fair Value at September 30, 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 0 355,000
Level 2 | Mortgages payable | Carrying Amount at September 30, 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 355,000 0
Level 2 | Mortgages payable | Fair Value at September 30, 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 334,473 0
Level 2 | Credit facility term loan | Carrying Amount at September 30, 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 175,000 175,000
Level 2 | Credit facility term loan | Fair Value at September 30, 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 175,000 175,000
Level 2 | Credit facility revolver | Carrying Amount at September 30, 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 31,000 90,000
Level 2 | Credit facility revolver | Fair Value at September 30, 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 31,000 $ 90,000