COPT Defense Properties Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Equity - COPLP and Subsidiaries (Details)

Equity - COPLP and Subsidiaries (Details) (USD $)	1 Months Ended		12 Months Ended			0 Months Ended
Equity - COPLP and Subsidiaries (Details) (USD $)	Nov. 30, 2014	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 16, 2013	Jun. 16, 2014	Apr. 22, 2013
Preferred Stock
Number of shares issued			7,431,667us-gaap_PreferredStockSharesIssued
Aggregate liquidation preference			$ 199,083,000	$ 249,083,000
Stock redeemed or called during period value			50,000,000	84,750,000	55,000,000
Common Shares
Shares issued to the public	5,520,000	4,485,000
Per share value of common and preferred shares issued to the public (in dollars per share)	$ 27.30	$ 26.34
Net proceeds from issue of shares after underwriter discounts but before offering expenses	148,900,000	118,100,000	148,666,000	117,961,000
Number of common shares for each converted common unit (in shares)			1
Number of operating partnerships units converted into common shares (in units)			140,149	311,343	234,246
Dividends declared per common share			$ 1.1000	$ 1.10	$ 1.10
Preferred units in COPLP			8,800,000	8,800,000
Common Stock Issued to Public Under At-the-Market Program
Common Shares
Shares issued to the public				1,500,000		1,500,000
Net proceeds from issue of shares after underwriter discounts but before offering expenses						38,500,000
Issuance of stock, weighted average price per share						$ 26.05
Payments of stock issuance costs						586,000
Preferred Shares
Common Shares
Net proceeds from issue of shares after underwriter discounts but before offering expenses					165,652,000
Series H
Preferred Stock
Annual dividend yield							7.50%
Preferred stock, redemption price per share							$ 25.00
Stock redeemed or called during period value							50,000,000
Issuance costs associated with redeemed preferred shares							1,800,000
Series K
Preferred Stock
Number of shares issued			531,667
Aggregate liquidation preference			26,583,000
Annual dividend yield			5.60%
Annual dividend per share (in dollars per share)			$ 2.80000
Number of common shares to be issued on conversion of each preferred share			0.8163
Series L Cumulative Preferred Stock
Preferred Stock
Number of shares issued			6,900,000
Aggregate liquidation preference			172,500,000
Annual dividend yield			7.375%
Annual dividend per share (in dollars per share)			$ 1.84375
Series J
Preferred Stock
Annual dividend yield								7.625%
Preferred stock, redemption price per share								$ 25.00
Stock redeemed or called during period value								84,800,000
Issuance costs associated with redeemed preferred shares								2,900,000
Common Shares
Common Shares
Net proceeds from issue of shares after underwriter discounts but before offering expenses					204,696,000
Corporate Office Properties, L.P.
Preferred Stock
Number of shares issued			7,431,667
Aggregate liquidation preference			199,083,000
Stock redeemed or called during period value			50,000,000	84,750,000	55,000,000
Common Shares
Net proceeds from issue of shares after underwriter discounts but before offering expenses			148,666,000	117,961,000
Number of common shares for each converted common unit (in shares)			1
Number of operating partnerships units converted into common shares (in units)			140,149.000	311,343.000
Dividends declared per common share			$ 1.1	$ 1.10	$ 1.10
Corporate Office Properties, L.P. \| Common Stock Issued to Public Under At-the-Market Program
Common Shares
Shares issued to the public						1,500,000
Net proceeds from issue of shares after underwriter discounts but before offering expenses						38,500,000
Issuance of stock, weighted average price per share						$ 26.05
Payments of stock issuance costs						586,000
Corporate Office Properties, L.P. \| Common Units
Common Shares
Percentage ownership in operating partnership			96.00%	95.60%
Corporate Office Properties, L.P. \| Conversion of Series I preferred units
Preferred Stock
Annual dividend yield			7.50%
Annual cumulative preferred return increment frequency			5 years
Common Shares
Limited partners' capital account, units issued			352,000
Preferred units in COPLP			8,800,000
Preferred stock, liquidation preference per share			$ 25
Common units conversion basis units issuable			0.5
Corporate Office Properties, L.P. \| Preferred Shares
Common Shares
Net proceeds from issue of shares after underwriter discounts but before offering expenses					165,652,000
Corporate Office Properties, L.P. \| Series H
Preferred Stock
Annual dividend yield							7.50%
Preferred stock, redemption price per share							$ 25.00
Stock redeemed or called during period value							50,000,000
Issuance costs associated with redeemed preferred shares							1,800,000
Corporate Office Properties, L.P. \| Series K
Preferred Stock
Number of shares issued			531,667
Aggregate liquidation preference			26,583,000
Annual dividend yield			5.60%
Annual dividend per share (in dollars per share)			$ 2.80000
Number of common shares to be issued on conversion of each preferred share			0.8163
Corporate Office Properties, L.P. \| Series L Cumulative Preferred Stock
Preferred Stock
Number of shares issued			6,900,000
Aggregate liquidation preference			172,500,000
Annual dividend yield			7.375%
Annual dividend per share (in dollars per share)			$ 1.84375
Corporate Office Properties, L.P. \| Series J
Preferred Stock
Annual dividend yield								7.625%
Preferred stock, redemption price per share								$ 25.00
Stock redeemed or called during period value								84,800,000
Issuance costs associated with redeemed preferred shares								2,900,000
Corporate Office Properties, L.P. \| Common Shares
Common Shares
Shares issued to the public	5,520,000	4,485,000.000
Per share value of common and preferred shares issued to the public (in dollars per share)	$ 27.30	$ 26.34
Net proceeds from issue of shares after underwriter discounts but before offering expenses	$ 148,900,000	$ 118,100,000			$ 204,696,000