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Senior Notes (Tables)
 9 Months Ended
Sep. 30, 2022
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, 2021September 30, 2022
Long-term liabilities:
Principal amount$400,000 $400,000 
Debt discount, net of accumulated amortization of $301 and $669, respectively
(4,199)(3,831)
Debt issuance costs, net of accumulated amortization of $86 and $190, respectively
(1,191)(1,087)
Carrying value of the Senior Notes$394,610 $395,082 
Schedule of Long-term Debt
Our Credit Facility and Acquisition debt consisted of the following (in thousands):
December 31, 2021September 30, 2022
Credit Facility$155,400 $169,000 
Debt issuance costs, net of accumulated amortization of $1,324 and $1,617, respectively
(1,543)(1,590)
Total Credit Facility$153,857 $167,410 
Acquisition debt$4,500 $4,460 
Less: current portion(521)(614)
Total acquisition debt, net of current portion$3,979 $3,846 
The imputed interest expense related to our acquisition debt is as follows (in thousands):
Three months ended September 30,Nine months ended September 30,
2021202220212022
Acquisition debt imputed interest expense$90 $78 $280 $237 
The interest expense and amortization of debt discount, debt premium and debt issuance costs related to our Senior Notes are as follows (in thousands):
Three months ended September 30,Nine months ended September 30,
2021202220212022
Senior Notes interest expense$4,250 $4,250 $17,517 $12,730 
Senior Notes amortization of debt discount118 125 384 368 
Senior Notes amortization of debt premium— — 85 — 
Senior Notes amortization of debt issuance costs34 35 161 104