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Prepaid Expenses and Other Assets, Net (Prepaid Expenses and Other Assets, Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]        
Restricted cash $ 3,664 $ 3,397 $ 3,884 $ 2,570
Marketable securities in deferred compensation plan 3,027 3,060    
Total 104,583 96,076    
Corporate Office Properties, L.P        
Property, Plant and Equipment [Line Items]        
Lease incentives, net 35,642 28,433    
Prepaid expenses 19,690 18,835    
Furniture, fixtures and equipment, net 10,433 7,823    
Construction contract costs in excess of billings, net 10,343 17,223    
Net investment in sales-type leases 6,573 0    
Non-real estate equity investments 5,509 6,705    
Restricted cash 3,664 3,397 $ 3,884 $ 2,570
Deferred financing costs, net 2,439 3,633    
Deferred tax asset, net 1,989 2,328    
Other assets 5,274 4,639    
Total $ 101,556 $ 93,016