Quarterly report pursuant to Section 13 or 15(d)

Prepaid Expenses and Other Assets, Net (Details)

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Prepaid Expenses and Other Assets, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Properties        
Restricted cash $ 3,502 $ 3,884 $ 3,440 $ 2,570
Marketable securities in deferred compensation plan 4,257 3,868    
Total for COPT and subsidiaries 100,582 91,198    
Finance right-of-use assets 41,660      
Furniture, Fixtures and Equipment, Net        
Properties        
Finance right-of-use assets 1,200      
Taxable REIT Subsidiary        
Properties        
Deferred tax assets, valuation allowance 2,000 2,700    
Corporate Office Properties, L.P.        
Properties        
Lease incentives, net 26,179 21,258    
Prepaid expenses 25,158 25,658    
Construction contract costs incurred in excess of billings 16,743 3,189    
Furniture, fixtures and equipment, net 7,931 8,630    
Non-real estate equity investments 6,153 5,940    
Deferred financing costs, net 3,914 4,733    
Restricted cash 3,502 3,884 $ 3,440 $ 2,570
Deferred tax asset, net 2,294 2,084    
Interest rate derivatives 32 5,617    
Other assets 4,419 6,337    
Total for COPT and subsidiaries $ 96,325 $ 87,330