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Convertible Notes and Credit Facility (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of debt
The carrying values of the components of the 2014 Notes and the 2019 Notes are as follows (in thousands):
September 30, 2020December 31, 2019
   2.75% 2014 Notes due 2034
Principal amount$1,079 $1,079 
Unamortized debt discount(17)(18)
Unamortized debt issuance cost(4)(4)
$1,058 $1,057 
    5.25% 2019 Notes due 2024
Principal amount $55,000 $55,000 
Unamortized debt issuance cost(1,937)(2,236)
$53,063 $52,764 
    Net carrying value of all Notes$54,121 $53,821 
The following table summarizes the par value, carrying value and the estimated fair value of the 2014 and 2019 Notes at September 30, 2020 and December 31, 2019, respectively (in thousands):
September 30, 2020December 31, 2019
Par ValueCarrying ValueFair ValuePar ValueCarrying ValueFair Value
2014 Notes$1,079 $1,058 $1,122 $1,079 $1,057 $1,122 
2019 Notes55,000 53,063 143,039 55,000 52,764 73,975 
Total$56,079 $54,121 $144,161 $56,079 $53,821 $75,097