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Debt (Details 2) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Carrying amount and estimated fair value of debt |  |  |  |
Carrying Value | $ 2,099,343 |  | $ 1,927,703 |
4.25% Exchangeable Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Carrying Value | 567 | [1] | 563 | [1]
Carrying Amount |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Variable-rate debt | 607,288 |  | 657,691 |
Carrying Value | 2,099,343 |  | 1,927,703 |
Carrying Amount | Unsecured senior notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 890,386 |  | 592,689 |
Carrying Amount | 4.25% Exchangeable Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 567 |  | 563 |
Carrying Amount | Other fixed-rate debt |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 601,102 |  | 676,760 |
Total Estimated Fair Value |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Variable-rate debt | 609,085 |  | 657,527 |
Carrying Value | 2,096,550 |  | 1,884,473 |
Total Estimated Fair Value | Unsecured senior notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 897,188 |  | 575,374 |
Total Estimated Fair Value | 4.25% Exchangeable Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 575 |  | 575 |
Total Estimated Fair Value | Other fixed-rate debt |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | $ 589,702 |  | $ 650,997 |
[1] | 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

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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