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Debt (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  | 0 Months Ended |  |  |  |  | 6 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 Mortgage and Other Secured Loans: | Dec. 31, 2013 Mortgage and Other Secured Loans: | Jun. 30, 2014 Fixed rate mortgage loans | Dec. 31, 2013 Fixed rate mortgage loans | Jun. 30, 2014 Variable rate secured loans | Dec. 31, 2013 Variable rate secured loans | Jun. 30, 2014 Revolving Credit Facility | Dec. 31, 2013 Revolving Credit Facility | Jun. 30, 2014 Term Loan Facilities | Dec. 31, 2013 Term Loan Facilities | Jun. 30, 2014 Unsecured notes payable | Dec. 31, 2013 Unsecured notes payable | Jun. 30, 2014 4.25% Exchangeable Senior Notes | Jun. 30, 2013 4.25% Exchangeable Senior Notes | Jun. 30, 2014 4.25% Exchangeable Senior Notes | Jun. 30, 2013 4.25% Exchangeable Senior Notes | Dec. 31, 2013 4.25% Exchangeable Senior Notes | Apr. 01, 2014 Debt in default of payment terms Wholly owned subsidiary | Apr. 01, 2014 Debt in default of payment terms Wholly owned subsidiary Northern Virginia Property | Jun. 30, 2014 Construction loans Fixed rate mortgage loans | Jun. 30, 2014 Unsecured senior notes 3.60% Senior Notes | Dec. 31, 2013 Unsecured senior notes 3.60% Senior Notes | Jun. 30, 2014 Unsecured senior notes 5.250% Senior Notes | Dec. 31, 2013 Unsecured senior notes 5.250% Senior Notes | May 14, 2014 Unsecured senior notes 3.70% Senior Notes | Jun. 30, 2014 Unsecured senior notes 3.70% Senior Notes | May 14, 2014 Unsecured senior notes 3.70% Senior Notes | Dec. 31, 2013 Unsecured senior notes 3.70% Senior Notes | Jun. 30, 2014 Revolving Credit Facility | Jun. 30, 2014 Minimum Revolving Credit Facility | Jun. 30, 2014 Minimum Term Loan Facilities | Jun. 30, 2014 Maximum Revolving Credit Facility | Jun. 30, 2014 Maximum Term Loan Facilities | May 14, 2014 Adjusted Treasury Unsecured senior notes 3.70% Senior Notes
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Availability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 | [1] |  |  |  |  |  |  |  |  |
Carrying Value | 2,099,343,000 |  | 2,099,343,000 |  | 1,927,703,000 | 636,736,000 | 712,751,000 | 599,448,000 | [2] | 675,060,000 | [2] | 37,288,000 |  | 37,691,000 | 0 | [1] | 0 | [1] | 570,000,000 |  | 620,000,000 | 1,654,000 |  | 1,700,000 | 567,000 | [3] |  | 567,000 | [3] |  | 563,000 | [3] | 150,000,000 |  | 24,200,000 | 347,369,000 | [4] | 347,244,000 | [4] | 245,619,000 | [5] | 245,445,000 | [5] |  | 297,398,000 | [6] |  | 0 | [6] |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Interest Rates, low end of range (as a percent) |  |  |  |  |  |  |  | 3.96% | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Interest Rates, high end of range (as a percent) |  |  |  |  |  |  |  | 7.87% | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate basis |  |  |  |  |  |  |  |  |  |  |  | LIBOR | [8] |  | LIBOR | [1] |  |  | LIBOR | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.25% | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.975% | [1] | 1.10% | [9] | 1.75% | [1] | 2.60% | [9] |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | [10] |  | 4.25% |  |  | 4.25% |  |  |  |  | 5.65% |  |  | 3.60% |  |  |  | 5.25% |  |  |  |  | 3.70% |  | 3.70% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance as a percentage of principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.739% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 297,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized premium included in carrying value |  |  |  |  |  |  |  | 55,000 |  | 69,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,200,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  |  |  | 5.95% |  |  |  |  |  |  |  |  |  |  | 1.78% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing capacity available provided there is no default under the agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000,000 |  |  |  | 250,000,000 |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount included in carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 707,000 |  | 761,000 | 8,000 |  |  | 8,000 |  |  | 12,000 |  |  |  |  | 2,600,000 |  | 2,800,000 |  | 4,400,000 |  | 4,600,000 |  |  | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate, including amortization of issuance costs (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.05% |  |  | 6.05% |  |  |  |  |  |  |  | 3.70% |  |  |  | 5.49% |  |  |  |  |  |  | 3.85% |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate per $1000 principal amount (in common shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.8513 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt principal amount, basis for exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per common share based on exchange rate (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 47.96 |  |  | $ 47.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 575,000 |  |  | 575,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense at stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000 |  | 1,891,000 | 12,000 |  | 4,195,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense associated with amortization of discount |  |  | 400,000 | 1,328,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  | 747,000 | 5,000 |  | 1,611,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000 |  | 2,638,000 | 17,000 |  | 5,806,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest costs | $ 1,400,000 | $ 2,100,000 | $ 3,000,000 | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis points used in determining redemption price prior to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25%
[1] | No borrowings were outstanding on this facility as of the end of the respective periods.
[2] | Several of the fixed rate mortgages carry interest rates that were above or below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates. The carrying values of these loans reflect net unamortized premiums totaling $55,000 as of June 30, 2014 and $69,000 as of December 31, 2013.
[3] | As described further in our 2013 Annual Report on Form 10-K, these notes have an exchange settlement feature that provides that the notes may, under certain circumstances, be exchangeable for cash and, at COPLP’s discretion, COPT common shares at an exchange rate (subject to adjustment) of 20.8513 shares per one thousand dollar principal amount of the notes (exchange rate is as of June 30, 2014 and is equivalent to an exchange price of $47.96 per common share). The carrying value of these notes included a principal amount of $575,000 and an unamortized discount totaling $8,000 as of June 30, 2014 and $12,000 as of December 31, 2013. The effective interest rate under the notes, including amortization of the issuance costs, was 6.05%. Because the closing price of our common shares as of June 30, 2014 and December 31, 2013 was less than the exchange price per common share applicable to these notes, the if-converted value of the notes did not exceed the principal amount. The table below sets forth interest expense recognized on these notes before deductions for amounts capitalized (in thousands): For the Three Months Ended June 30, For the Six Months Ended June 30, 2014 2013 2014 2013Interest expense at stated interest rate$6 $1,891 $12 $4,195Interest expense associated with amortization of discount2 747 5 1,611Total$8 $2,638 $17 $5,806
[4] | The carrying value of these notes included a principal amount of $350.0 million and an unamortized discount totaling $2.6 million as of June 30, 2014 and $2.8 million as of December 31, 2013. The effective interest rate under the notes, including amortization of the issuance costs, was 3.70%.
[5] | The carrying value of these notes included a principal amount of $250.0 million and an unamortized discount totaling $4.4 million as of June 30, 2014 and $4.6 million as of December 31, 2013. The effective interest rate under the notes, including amortization of the issuance costs, was 5.49%.
[6] | Refer to the paragraph below for disclosure pertaining to these notes.
[7] | The weighted average interest rate on these loans was 5.95% as of June 30, 2014.
[8] | The interest rate on the loan outstanding was 2.40% as of June 30, 2014.
[9] | The weighted average interest rate on these loans was 1.78% as of June 30, 2014.
[10] | These notes carry interest rates that were below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates. The carrying value of these notes reflects an unamortized discount totaling $707,000 as of June 30, 2014 and $761,000 as of December 31, 2013.

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