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

Annual report pursuant to Section 13 and 15(d)

Debt (Details)

Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Jun. 29, 2015	May 14, 2014
Debt
Debt, net	$ 1,904,001	$ 2,077,752
Deferred financing costs, net	3,128	5,867
Long-term debt gross	1,920,229
Revolving Credit Facility [Member]
Debt
Debt, net	0	43,500
Term Loan Facilities [Member]
Debt
Debt, net	$ 547,494	515,902
Weighted average interest rate (as a percent)	2.23%
Aggregate additional borrowing capacity	$ 350,000
Unsecured notes payable [Member]
Debt
Debt, net	1,401	1,508
Unamortized discount included in carrying value	$ 460	554
London Interbank Offered Rate (LIBOR) [Member] \| Revolving Credit Facility [Member] \| Minimum [Member]
Debt
Variable rate, spread (as a percent)	0.875%
London Interbank Offered Rate (LIBOR) [Member] \| Revolving Credit Facility [Member] \| Maximum [Member]
Debt
Variable rate, spread (as a percent)	1.60%
London Interbank Offered Rate (LIBOR) [Member] \| Term Loan Facilities [Member] \| Minimum [Member]
Debt
Variable rate, spread (as a percent)	0.90%
London Interbank Offered Rate (LIBOR) [Member] \| Term Loan Facilities [Member] \| Maximum [Member]
Debt
Variable rate, spread (as a percent)	2.40%
Mortgage and other secured debt [Member]
Debt
Debt, net	$ 167,591	331,000
Mortgage and other secured debt [Member] \| Fixed rate mortgage loans [Member]
Debt
Debt, net	154,143	281,208
Unamortized premium included in carrying value	$ 422	514
Weighted average interest rate (as a percent)	4.19%
Mortgage and other secured debt [Member] \| Fixed rate mortgage loans [Member] \| Minimum [Member]
Debt
Stated interest rate (as a percent)	3.82%
Mortgage and other secured debt [Member] \| Fixed rate mortgage loans [Member] \| Maximum [Member]
Debt
Stated interest rate (as a percent)	7.87%
Mortgage and other secured debt [Member] \| Variable rate secured loans [Member]
Debt
Debt, net	$ 13,448	49,792
Stated interest rate (as a percent)	2.47%
Mortgage and other secured debt [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Variable rate secured loans [Member]
Debt
Variable rate, spread (as a percent)	1.85%
Senior Notes [Member] \| 3.60% Senior Notes [Member]
Debt
Debt, net	$ 347,128	346,714
Stated interest rate (as a percent)	3.60%
Interest rate on debt (as a percent)	3.70%
Unamortized discount included in carrying value	$ 2,000	2,200
Senior Notes [Member] \| 5.250% Senior Notes [Member]
Debt
Debt, net	$ 246,176	245,731
Stated interest rate (as a percent)	5.25%
Interest rate on debt (as a percent)	5.49%
Unamortized discount included in carrying value	$ 3,400	3,800
Senior Notes [Member] \| 3.70% Senior Notes [Member]
Debt
Debt, net	$ 297,843	297,378
Stated interest rate (as a percent)	3.70%			3.70%
Interest rate on debt (as a percent)	3.85%
Unamortized discount included in carrying value	$ 1,700	2,100
Senior Notes [Member] \| 5.0% Senior Notes [Member]
Debt
Debt, net	$ 296,368	296,019
Stated interest rate (as a percent)	5.00%		5.00%
Interest rate on debt (as a percent)	5.15%
Unamortized discount included in carrying value	$ 3,000	3,300
Loans Payable [Member]
Debt
Deferred financing costs, net	$ 6,100	$ 8,000