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Senior Notes (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The carrying value of our 4.25% senior notes due 2029 (the “Senior Notes”) is reflected on our Consolidated Balance Sheet as follows (in thousands):
December 31, 2022September 30, 2023
Long-term liabilities:
Principal amount$400,000 $400,000 
Debt discount, net of accumulated amortization of $794 and $1,178, respectively
(3,706)(3,322)
Debt issuance costs, net of accumulated amortization of $226 and $336, respectively
(1,051)(941)
Carrying value of the Senior Notes$395,243 $395,737 
Schedule of Long-term Debt
Our Credit Facility and acquisition debt consisted of the following (in thousands):
December 31, 2022September 30, 2023
Credit Facility$190,700 $187,300 
Debt issuance costs, net of accumulated amortization of $1,926 and $2,340, respectively
(1,864)(1,444)
Total Credit Facility$188,836 $185,856 
Acquisition debt$3,993 $3,924 
Less: current portion(555)(589)
Total acquisition debt, net of current portion$3,438 $3,335 
The imputed interest expense related to our acquisition debt is as follows (in thousands):
Three months ended September 30,Nine months ended September 30,
2022202320222023
Acquisition debt imputed interest expense$78 $70 $237 $212 
The interest expense and amortization of debt discount and debt issuance costs related to our Senior Notes are as follows (in thousands):
Three months ended September 30,Nine months ended September 30,
2022202320222023
Senior Notes interest expense$4,250 $4,250 $12,730 $12,750 
Senior Notes amortization of debt discount125 129 368 384 
Senior Notes amortization of debt issuance costs35 37 104 110