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Long-Term Debt (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of outstanding senior notes issuances
The following tables detail the issuances of Senior Notes outstanding at September 30, 2020 and December 31, 2019:
    
September 30, 20202016 Senior Notes2013 Senior NotesTotal
Principal amount
$110,000 $152,500 $262,500 
Less: unamortized issuance costs3,528 3,901 7,429 
Carrying value$106,472 $148,599 $255,071 
December 31, 20192016 Senior Notes2013 Senior NotesTotal
Principal amount
$110,000 $152,500 $262,500 
Less: unamortized issuance costs3,565 4,027 7,592 
Carrying value$106,435 $148,473 $254,908 
Other details:
Original debt issuance costs$3,715 $5,054 
Maturity dateJune 14, 2046December 1, 2043
Earliest redeemable date (for cash)June 14, 2021December 1, 2018
Coupon rate6.625 %7.75 %
Effective interest rate7.07 %8.04 %