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) - USD ($)	3 Months Ended
Debt, Net (Details) - USD ($)	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt
Carrying Value	$ 1,903,657,000		$ 1,904,001,000
Deferred financing costs, net	2,444,000		3,128,000
Interest costs capitalized	1,500,000	$ 1,800,000
Secured Debt
Debt
Carrying Value	166,659,000		167,591,000
Loans payable
Debt
Deferred financing costs, net	5,700,000		6,100,000
Fixed rate debt \| Secured Debt
Debt
Carrying Value	153,294,000		154,143,000
Unamortized premium included in carrying value	$ 403,000		422,000
Weighted average interest rate (as a percent)	4.19%
Fixed rate debt \| Secured Debt \| Minimum
Debt
Stated interest rate (as a percent)	3.82%
Fixed rate debt \| Secured Debt \| Maximum
Debt
Stated interest rate (as a percent)	7.87%
Variable-rate debt
Debt
Description of variable rate basis	LIBOR
Variable-rate debt \| Secured Debt
Debt
Carrying Value	$ 13,365,000		13,448,000
Stated interest rate (as a percent)	2.63%
Variable-rate debt \| Secured Debt \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)	1.85%
Revolving Credit Facility
Debt
Carrying Value	$ 0		0
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%
Term Loan Facilities
Debt
Carrying Value	$ 547,682,000		547,494,000
Description of variable rate basis	LIBOR
Weighted average interest rate (as a percent)	2.37%
Aggregate additional borrowing capacity available	$ 350,000,000
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)	2.40%
3.60% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 347,233,000		347,128,000
Debt instrument, face amount	$ 350,000,000
Stated interest rate (as a percent)	3.60%
Unamortized discount included in carrying value	$ 1,900,000		2,000,000
Interest rate on debt (as a percent)	3.70%
5.250% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 246,291,000		246,176,000
Debt instrument, face amount	$ 250,000,000
Stated interest rate (as a percent)	5.25%
Unamortized discount included in carrying value	$ 3,300,000		3,400,000
Interest rate on debt (as a percent)	5.49%
3.70% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 297,961,000		297,843,000
Debt instrument, face amount	$ 300,000,000
Stated interest rate (as a percent)	3.70%
Unamortized discount included in carrying value	$ 1,600,000		1,700,000
Interest rate on debt (as a percent)	3.85%
5.000% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 296,457,000		296,368,000
Debt instrument, face amount	$ 300,000,000
Stated interest rate (as a percent)	5.00%
Unamortized discount included in carrying value	$ 2,900,000		3,000,000
Interest rate on debt (as a percent)	5.15%
Unsecured notes payable
Debt
Carrying Value	$ 1,374,000		1,401,000
Stated interest rate (as a percent)	0.00%
Unamortized discount included in carrying value	$ 438,000		$ 460,000