Annual report pursuant to Section 13 and 15(d)

Orion Office REIT, Receivables and Other Assets - Other Assets (Details)

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Orion Office REIT, Receivables and Other Assets - Other Assets (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
property
note
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Receivables [Abstract]        
Restricted cash $ 34,725 $ 34,673 $ 0 $ 3,915
Operating lease, right-of-use asset, statement of financial position [Extensible Enumeration] Total Total    
Finance lease, right-of-use asset, statement of financial position [Extensible Enumeration] Total Total    
Right-of-use assets, net $ 26,596 $ 26,422    
Investment in unconsolidated joint venture 13,549 15,824    
Deferred costs, net 7,693 4,619    
Notes receivable 3,700 0    
Prepaid expenses 1,318 1,305    
Derivative assets 0 6,308    
Other assets, net 1,247 1,063    
Total 88,828 90,214    
Amortization expense for below market right-of-use, less than 200 200 100  
Finance lease, right-of-use 9,000 9,000    
Right-of-use assets, net 10,900 10,600    
Below market lease, right-of-use asset 6,600 6,800    
Line of Credit Facility [Line Items]        
Amortization of debt issuance costs 3,974 4,364 728  
Deferred equity offering costs $ 600 500    
Number of promissory notes | note 2      
Number of properties sold subject to loans | property 2      
Line of Credit | Credit facility revolver        
Line of Credit Facility [Line Items]        
Amortization of debt issuance costs $ 2,600 2,200 $ 300  
Accumulated amortization of deferred costs 5,100 $ 2,500    
Deferred costs capitalized $ 5,600