COPT Defense Properties Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Debt, Net (Details)

Debt, Net (Details)				3 Months Ended		6 Months Ended
Debt, Net (Details)	Jun. 29, 2015 USD ($)	May. 06, 2015 USD ($) extensions	Apr. 20, 2015	Jun. 30, 2015 USD ($) Property	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Property	Jun. 30, 2014 USD ($)	May. 05, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt
Carrying Value				$ 2,130,170,000		$ 2,130,170,000			$ 1,920,057,000
Interest costs capitalized				2,000,000	$ 1,400,000	4,100,000	$ 3,000,000
Wholly owned subsidiary
Debt
Debt default amount				150,000,000.0		150,000,000.0
Line of Credit \| Revolving Credit Facility
Debt
Number of extensions \| extensions		2
Term of extension option		6 months
Line of Credit \| Revolving Credit Facility \| Minimum
Debt
Commitment fee (as a percent)		0.125%
Line of Credit \| Revolving Credit Facility \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)		0.875%
Line of Credit \| Revolving Credit Facility \| Maximum
Debt
Commitment fee (as a percent)		0.30%
Line of Credit \| Revolving Credit Facility \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)		1.60%
Line of Credit \| Term Loan Facilities
Debt
Maximum availability		$ 300,000,000						$ 250,000,000
Increase to maximum borrowing capacity		200,000,000
Aggregate maximum borrowing capacity		500,000,000
Proceeds from issuance of debt		$ 50,000,000
Line of Credit \| Term Loan Facilities \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)		0.90%
Line of Credit \| Term Loan Facilities \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)		1.85%
Mortgage and Other Secured Loans:
Debt
Carrying Value				420,684,000		420,684,000			424,016,000
Fixed rate mortgage loans
Debt
Carrying Value				384,227,000		$ 384,227,000			387,139,000
Stated interest rates, low end of range (as a percent)						3.96%
Stated interest rates, high end of range (as a percent)						10.65%
Unamortized premium included in carrying value				$ 30,000		$ 30,000			42,000
Weighted average interest rate (as a percent)				8.11%		8.11%
Weighted-average interest rate excluding incremental rate on default rate				6.16%		6.16%
Fixed rate mortgage loans \| Maximum
Debt
Interest rate excluding incremental rate on default rate (percent)				7.87%		7.87%
Variable rate secured loans
Debt
Carrying Value				$ 36,457,000		$ 36,457,000			36,877,000
Description of variable rate basis						LIBOR
Stated interest rate (as a percent)				2.43%		2.43%
Variable rate secured loans \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)						2.25%
Variable rate secured loans \| Revolving Credit Facility
Debt
Weighted average interest rate (as a percent)				1.37%		1.37%
Revolving Credit Facility
Debt
Carrying Value				$ 0		$ 0			83,000,000
Description of variable rate basis						LIBOR
Revolving Credit Facility \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)						0.875%
Revolving Credit Facility \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)						1.60%
Revolving Credit Facility \| Revolving Credit Facility
Debt
Maximum availability				800,000,000		$ 800,000,000
Term Loan Facilities
Debt
Carrying Value				$ 520,000,000		$ 520,000,000			520,000,000
Description of variable rate basis						LIBOR
Weighted average interest rate (as a percent)				1.77%		1.77%
Additional borrowing capacity available provided there is no default under the agreement				$ 380,000,000		$ 380,000,000
Term Loan Facilities \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)						0.90%
Term Loan Facilities \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)						2.60%
3.60% Senior Notes \| Unsecured senior notes
Debt
Carrying Value				$ 347,625,000		$ 347,625,000			347,496,000
Stated interest rate (as a percent)				3.60%		3.60%
Debt instrument, face amount				$ 350,000,000		$ 350,000,000
Unamortized discount included in carrying value				$ 2,400,000		$ 2,400,000			2,500,000
Interest rate on debt (as a percent)				3.70%		3.70%
5.250% Senior Notes \| Unsecured senior notes
Debt
Carrying Value				$ 245,980,000		$ 245,980,000			245,797,000
Stated interest rate (as a percent)				5.25%		5.25%
Debt instrument, face amount				$ 250,000,000		$ 250,000,000
Unamortized discount included in carrying value				$ 4,000,000		$ 4,000,000			4,200,000
Interest rate on debt (as a percent)				5.49%		5.49%
3.70% Senior Notes \| Unsecured senior notes
Debt
Carrying Value				$ 297,743,000		$ 297,743,000			297,569,000
Stated interest rate (as a percent)				3.70%		3.70%
Debt instrument, face amount				$ 300,000,000		$ 300,000,000
Unamortized discount included in carrying value				$ 2,300,000		$ 2,300,000			2,400,000
Interest rate on debt (as a percent)				3.85%		3.85%
5.000% Senior Notes \| Unsecured senior notes
Debt
Carrying Value				$ 296,580,000		$ 296,580,000			0
Stated interest rate (as a percent)	5.00%			5.00%		5.00%
Debt instrument, face amount	$ 300,000,000
Unamortized discount included in carrying value				$ 3,400,000		$ 3,400,000
Interest rate on debt (as a percent)				5.15%		5.15%
Debt issuance as a percentage of principal amount	99.51%
Proceeds from debt, net	$ 296,600,000
Redemption price ( as a percent)	100.00%
5.000% Senior Notes \| Unsecured senior notes \| Adjusted Treasury
Debt
Basis points used in determining redemption price prior to maturity	0.45%
Unsecured notes payable
Debt
Carrying Value				$ 1,558,000		$ 1,558,000			1,607,000
Stated interest rate (as a percent)				0.00%		0.00%
Unamortized discount included in carrying value				$ 603,000		$ 603,000			654,000
4.25% Exchangeable Senior Notes
Debt
Carrying Value				$ 0		$ 0			$ 572,000
Stated interest rate (as a percent)				4.25%		4.25%
Percentage of principal amount redeemed			100.00%
Debt in default of payment terms \| Wholly owned subsidiary
Debt
Stated interest rate (as a percent)				10.65%		10.65%
Debt in default of payment terms \| Wholly owned subsidiary \| Northern Virginia
Debt
Number of real estate properties \| Property				2		2