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Debt (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 0 Months Ended |  |  | 0 Months Ended |  |  |  |  | 0 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Mortgage and Other Secured Loans: | Dec. 31, 2012 Mortgage and Other Secured Loans: | Sep. 30, 2013 Fixed rate mortgage loans | Dec. 31, 2012 Fixed rate mortgage loans | Sep. 30, 2013 Variable rate secured loans | Dec. 31, 2012 Variable rate secured loans | Sep. 30, 2013 Other construction loan facilities | Dec. 31, 2012 Other construction loan facilities | Sep. 30, 2013 Revolving Credit Facility | Dec. 31, 2012 Revolving Credit Facility | Sep. 30, 2013 Term Loan Facility | Dec. 31, 2012 Term Loan Facility | Sep. 30, 2013 Unsecured notes payable | Dec. 31, 2012 Unsecured notes payable | Sep. 30, 2013 4.25% Exchangeable Senior Notes | Sep. 30, 2012 4.25% Exchangeable Senior Notes | Sep. 30, 2013 4.25% Exchangeable Senior Notes | Sep. 30, 2012 4.25% Exchangeable Senior Notes | Dec. 31, 2012 4.25% Exchangeable Senior Notes | Sep. 30, 2013 Unsecured senior notes | May 06, 2013 Unsecured senior notes 3.60% Senior Notes | Sep. 30, 2013 Unsecured senior notes 3.60% Senior Notes | Dec. 31, 2012 Unsecured senior notes 3.60% Senior Notes | Sep. 15, 2013 Unsecured senior notes 5.250% Senior Notes | Sep. 30, 2013 Unsecured senior notes 5.250% Senior Notes | Sep. 16, 2013 Unsecured senior notes 5.250% Senior Notes | Dec. 31, 2012 Unsecured senior notes 5.250% Senior Notes | Sep. 30, 2013 Adjusted Treasury Unsecured senior notes 3.60% Senior Notes | Sep. 30, 2013 Adjusted Treasury Unsecured senior notes 5.250% Senior Notes | Jul. 16, 2013 Amendment Number 1 Revolving Credit Facility | Jul. 16, 2013 Amendment Number 2 London Interbank Offered Rate (LIBOR) Unsecured notes payable Term Loan Facility | Sep. 30, 2013 Minimum Revolving Credit Facility | Sep. 30, 2013 Minimum Term Loan Facility | Sep. 30, 2013 Minimum Amendment Number 1 Revolving Credit Facility London Interbank Offered Rate (LIBOR) | Sep. 30, 2013 Minimum Amendment Number 2 London Interbank Offered Rate (LIBOR) Term Loan Facility | Sep. 30, 2013 Maximum Revolving Credit Facility | Sep. 30, 2013 Maximum Term Loan Facility | Sep. 30, 2013 Maximum Amendment Number 1 Revolving Credit Facility London Interbank Offered Rate (LIBOR) | Sep. 30, 2013 Maximum Amendment Number 2 London Interbank Offered Rate (LIBOR) Term Loan Facility
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Availability |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,150,000 |  | $ 800,000,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | 2,135,031,000 |  | 2,135,031,000 |  | 2,019,168,000 | 920,205,000 | 1,016,446,000 | 882,311,000 | [2] | 948,414,000 | [2] | 37,894,000 |  | 38,475,000 | 0 | 29,557,000 | 0 | [1] | 0 | [1] | 620,000,000 | [3] | 770,000,000 | [3] | 1,723,000 | [4] | 1,788,000 | [4] | 560,000 | [5] |  | 560,000 | [5] |  | 230,934,000 | [5] |  |  | 347,183,000 | [4] | 0 | [4] |  | 245,360,000 | [4] |  | 0 | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | [6] |  |  | 4.25% |  |  | 4.25% |  |  |  |  |  | 3.60% | 3.60% |  |  |  |  | 5.25% |  | 5.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | [9] |  |  | LIBOR | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.25% | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.975% | [9] | 1.10% | [10] | 0.975% | 1.10% | 1.75% | [9] | 2.60% | [10] | 1.75% | 2.00%
Unamortized premium included in carrying value |  |  |  |  |  |  |  | 465,000 |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  |  |  | 5.98% |  |  |  |  |  |  |  |  | 1.45% |  |  |  | 1.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.43% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing capacity available provided there is no default under the agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt principal amount, basis for exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate per $1000 principal amount (in common shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.8513 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per common share based on exchange rate (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 47.96 |  |  | $ 47.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of debt repaid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 239,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt | 374,000 | 768,000 | 27,028,000 | 937,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 575,000 |  |  | 575,000 |  |  | 240,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate, including amortization of issuance costs (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.05% |  |  | 6.05% |  |  |  |  |  |  | 3.70% |  |  |  |  | 5.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Months Prior to Loan Maturity Requiring Redemption at Principal Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption Percentage Within Three Months of Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense at stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000 |  | 2,550,000 | 4,201,000 |  | 7,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense associated with amortization of discount |  |  | 1,207,000 | 2,357,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  | 919,000 | 1,613,000 |  | 2,717,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000 |  | 3,469,000 | 5,814,000 |  | 10,367,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument extension option, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Extension fee percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.15% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000,000 |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 347,100,000 |  |  |  |  | 245,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance as a percentage of principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.816% |  |  |  |  | 98.783% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis points used in determining redemption price prior to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount included in carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 788,000 |  | 873,000 |  | 15,000 |  |  | 15,000 |  |  | 9,100,000 |  |  |  | 2,800,000 |  |  |  |  | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest costs | $ 2,200,000 | $ 3,400,000 | $ 6,700,000 | $ 10,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Refer to the paragraph below for disclosure pertaining to the Revolving Credit Facility.
[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 $465,000 at September 30, 2013 and $1.3 million at December 31, 2012.
[3] | We have the ability to borrow an aggregate of an additional $180.0 million under these term loan facilities, provided that there is no default under the facilities and subject to the approval of the lenders.
[4] | Refer to the paragraphs below for disclosure pertaining to these notes.
[5] | As described further in our 2012 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 September 30, 2013 and is equivalent to an exchange price of $47.96 per common share). During the nine months ended September 30, 2013, we repaid $239.4 million principal amount of these notes and recognized a $25.9 million loss on early extinguishment of debt. The carrying value of these notes included a principal amount of $575,000 and an unamortized discount totaling $15,000 at September 30, 2013 and a principal amount of $240.0 million and an unamortized discount totaling $9.1 million at December 31, 2012. The effective interest rate under the notes, including amortization of the issuance costs, was 6.05%. Because the closing price of our common shares at September 30, 2013 and December 31, 2012 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 September 30, For the Nine Months Ended September 30, 2013 2012 2013 2012Interest expense at stated interest rate$6 $2,550 $4,201 $7,650Interest expense associated with amortization of discount2 919 1,613 2,717Total$8 $3,469 $5,814 $10,367
[6] | 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 $788,000 at September 30, 2013 and $873,000 at December 31, 2012.
[7] | The weighted average interest rate on these loans was 5.98% at September 30, 2013.
[8] | The interest rate on the loan outstanding was 2.43% at September 30, 2013.
[9] | The weighted average interest rate on the Revolving Credit Facility was 1.45% at September 30, 2013.
[10] | The weighted average interest rate on these loans was 1.80% at September 30, 2013.

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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