Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.8.0.1
Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts- AR $ 607 $ 603
Allowance for deferred rent receivable 364 373
Accumulated amortization of deferred leasing costs $ 29,560 $ 65,988
Common Shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Common Shares of beneficial interest, shares authorized 150,000,000 125,000,000
Common Shares of beneficial interest, shares issued 101,292,299 98,498,651
Common Shares of beneficial interest, shares outstanding 101,292,299 98,498,651
Corporate Office Properties, L.P. [Member]    
Allowance for doubtful accounts- AR $ 607 $ 603
Allowance for deferred rent receivable 364 373
Accumulated amortization of deferred leasing costs $ 29,560 $ 65,988
Redeemable preferred units of general partner outstanding, in units   531,667
General Partner [Member] | Corporate Office Properties, L.P. [Member]    
Preferred Units, Outstanding 0 6,900,000
Common Shares of beneficial interest, shares outstanding 101,292,299 98,498,651
Limited Partner [Member] | Corporate Office Properties, L.P. [Member]    
Preferred Units, Outstanding 352,000 352,000
Common Shares of beneficial interest, shares outstanding 3,250,878 3,590,391