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Debt (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Carrying amount and estimated fair value of debt |  |  |  |
Carrying Value | $ 2,135,031 |  | $ 2,019,168 |
4.25% Exchangeable Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Carrying Value | 560 | [1] | 230,934 | [1]
Carrying Amount |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Variable-rate debt | 657,894 |  | 838,032 |
Carrying Value | 2,135,031 |  | 2,019,168 |
Carrying Amount | Unsecured senior notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 592,543 |  | 0 |
Carrying Amount | 4.25% Exchangeable Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 560 |  | 230,934 |
Carrying Amount | Other fixed-rate debt |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 884,034 |  | 950,202 |
Total Estimated Fair Value |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Variable-rate debt | 661,593 |  | 845,558 |
Carrying Value | 2,054,068 |  | 2,054,020 |
Total Estimated Fair Value | Unsecured senior notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 579,654 |  | 0 |
Total Estimated Fair Value | 4.25% Exchangeable Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 575 |  | 240,282 |
Total Estimated Fair Value | Other fixed-rate debt |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | $ 812,246 |  | $ 968,180 |
[1] | 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

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