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
Debt, Net (Details)	Mar. 31, 2018 USD ($) extension	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt
Carrying Value	$ 1,854,886,000		$ 1,828,333,000
Interest costs capitalized	1,400,000	$ 1,500,000
Secured Debt
Debt
Carrying Value	$ 162,864,000		163,838,000
Line of Credit \| Revolving Credit Facility
Debt
Number of extensions \| extension	2
Extension option period (in years)	6 months
Line of credit facility, extension fee percentage	0.075%
Loans payable
Debt
Deferred financing costs, net	$ 4,800,000		5,000,000
Fixed rate debt \| Secured Debt
Debt
Carrying Value	149,835,000		150,723,000
Unamortized premium included in carrying value	$ 332,000		349,000
Weighted average interest rate (as a percent)	4.18%
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 \| Secured Debt
Debt
Carrying Value	$ 13,029,000		13,115,000
Stated interest rate (as a percent)	3.51%
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	$ 153,000,000		126,000,000
Weighted average interest rate (as a percent)	2.77%
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	$ 348,072,000		347,959,000
Weighted average interest rate (as a percent)	3.03%
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)	1.85%
3.60% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 347,659,000		347,551,000
Debt instrument, face amount	$ 350,000,000
Stated interest rate (as a percent)	3.60%
Unamortized discount included in carrying value	$ 1,600,000		1,700,000
Interest rate on debt (as a percent)	3.70%
5.250% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 246,765,000		246,645,000
Debt instrument, face amount	$ 250,000,000
Stated interest rate (as a percent)	5.25%
Unamortized discount included in carrying value	$ 2,900,000		3,000,000
Interest rate on debt (as a percent)	5.49%
3.70% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 298,444,000		298,322,000
Debt instrument, face amount	$ 300,000,000
Stated interest rate (as a percent)	3.70%
Unamortized discount included in carrying value	$ 1,200,000		1,300,000
Interest rate on debt (as a percent)	3.85%
5.000% Senior Notes \| Unsecured senior notes
Debt
Carrying Value	$ 296,824,000		296,731,000
Debt instrument, face amount	$ 300,000,000
Stated interest rate (as a percent)	5.00%
Unamortized discount included in carrying value	$ 2,600,000		2,700,000
Interest rate on debt (as a percent)	5.15%
Unsecured notes payable
Debt
Carrying Value	$ 1,258,000		1,287,000
Stated interest rate (as a percent)	0.00%
Unamortized discount included in carrying value	$ 353,000		$ 373,000