Annual report pursuant to Section 13 and 15(d)

Prepaid Expenses and Other Assets, Net (Details)

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Prepaid Expenses and Other Assets, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]        
Restricted cash $ 3,397 $ 3,884 $ 2,570 $ 2,756
Marketable securities in deferred compensation plan 3,060 3,868    
Total for COPT and subsidiaries 96,076 91,198    
Finance right-of-use assets 41,654      
Corporate Office Properties, L.P        
Property, Plant and Equipment [Line Items]        
Lease incentives, net 28,433 21,258    
Prepaid expenses 18,835 25,658    
Construction contract costs in excess of billings 17,223 3,189    
Furniture, fixtures and equipment, net 7,823 8,630    
Non-real estate equity investments 6,705 5,940    
Deferred financing costs, net 3,633 4,733    
Restricted cash 3,397 3,884 $ 2,570 $ 2,756
Deferred tax asset, net 2,328 2,084    
Interest rate derivatives 23 5,617    
Other assets 4,616 6,337    
Total for COPT and subsidiaries 93,016 $ 87,330    
Furniture, Fixtures and Equipment, Net        
Property, Plant and Equipment [Line Items]        
Finance right-of-use assets $ 1,200