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Senior Notes (Tables)
 3 Months Ended
Mar. 31, 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, 2021March 31, 2022
Long-term liabilities:
Principal amount$400,000 $400,000 
Debt discount, net of accumulated amortization of $301 and $422, respectively
(4,199)(4,078)
Debt issuance costs, net of accumulated amortization of $86 and $120, respectively
(1,191)(1,157)
Carrying value of the Senior Notes$394,610 $394,765 
Schedule of Long-term Debt
Our Credit Facility and Acquisition debt consisted of the following (in thousands):
December 31, 2021March 31, 2022
Credit Facility$155,400 $174,200 
Debt issuance costs, net of accumulated amortization of $1,324 and $1,413, respectively
(1,543)(1,454)
Total Credit Facility$153,857 $172,746 
Acquisition debt$4,500 $4,487 
Less: current portion(521)(552)
Total acquisition debt, net of current portion$3,979 $3,935 
The imputed interest expense related to our acquisition debt is as follows (in thousands):
Three months ended March 31,
20212022
Acquisition debt imputed interest expense$97 $80 
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 March 31,
20212022
Senior Notes interest expense$6,625 $4,250 
Senior Notes amortization of debt discount138 121 
Senior Notes amortization of debt premium58 — 
Senior Notes amortization of debt issuance costs74 34