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, 2016	Mar. 31, 2015	Dec. 31, 2015
Debt
Carrying Value	$ 2,140,212,000		$ 2,077,752,000
Deferred financing costs, net	5,182,000		5,867,000
Interest costs capitalized	1,800,000	$ 2,100,000
Loans payable
Debt
Deferred financing costs, net	7,500,000		8,000,000
Mortgage and Other Secured Loans:
Debt
Carrying Value	329,270,000		331,000,000
Fixed rate mortgage loans
Debt
Carrying Value	$ 279,782,000		281,208,000
Stated interest rates, low end of range (as a percent)	3.96%
Stated interest rates, high end of range (as a percent)	7.87%
Unamortized premium included in carrying value	$ 489,000		514,000
Weighted-average interest rate excluding incremental rate on default rate	6.08%
Variable rate secured loans
Debt
Carrying Value	$ 49,488,000		49,792,000
Description of variable rate basis	LIBOR
Stated interest rate (as a percent)	2.40%
Variable rate secured loans \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)	1.85%
Variable rate secured loans \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)	2.00%
Variable rate secured loans \| Revolving Credit Facility
Debt
Weighted average interest rate (as a percent)	1.60%
Revolving Credit Facility
Debt
Carrying Value	$ 107,000,000		43,500,000
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%
Term Loan Facilities
Debt
Carrying Value	$ 516,205,000		515,902,000
Increase to maximum borrowing capacity	150,000,000
Aggregate additional borrowing capacity available	$ 430,000,000
Description of variable rate basis	LIBOR
Weighted average interest rate (as a percent)	2.08%
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	$ 346,817,000		346,714,000
Stated interest rate (as a percent)	3.60%
Debt instrument, face amount	$ 350,000
Unamortized discount included in carrying value	$ 2,200,000		2,200,000
Interest rate on debt (as a percent)	3.70%
5.250% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 245,840,000		245,731,000
Stated interest rate (as a percent)	5.25%
Debt instrument, face amount	$ 250,000
Unamortized discount included in carrying value	$ 3,700,000		3,800,000
Interest rate on debt (as a percent)	5.49%
3.70% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 297,493,000		297,378,000
Stated interest rate (as a percent)	3.70%
Debt instrument, face amount	$ 300,000
Unamortized discount included in carrying value	$ 2,000,000		2,100,000
Interest rate on debt (as a percent)	3.85%
5.000% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 296,105,000		296,019,000
Stated interest rate (as a percent)	5.00%
Debt instrument, face amount	$ 300,000
Unamortized discount included in carrying value	$ 3,200,000		3,300,000
Interest rate on debt (as a percent)	5.15%
Unsecured notes payable
Debt
Carrying Value	$ 1,482,000		1,508,000
Stated interest rate (as a percent)	0.00%
Unamortized discount included in carrying value	$ 530,000		$ 554,000