Quarterly report pursuant to Section 13 or 15(d)

Debt (Details 2)

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Debt (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
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