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Senior Notes (Tables)
 6 Months Ended
Jun. 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, 2021June 30, 2022
Long-term liabilities:
Principal amount$400,000 $400,000 
Debt discount, net of accumulated amortization of $301 and $544, respectively
(4,199)(3,955)
Debt issuance costs, net of accumulated amortization of $86 and $155, respectively
(1,191)(1,122)
Carrying value of the Senior Notes$394,610 $394,923 
Schedule of Long-term Debt
Our Credit Facility and Acquisition debt consisted of the following (in thousands):
December 31, 2021June 30, 2022
Credit Facility$155,400 $175,200 
Debt issuance costs, net of accumulated amortization of $1,324 and $1,508, respectively
(1,543)(1,699)
Total Credit Facility$153,857 $173,501 
Acquisition debt$4,500 $4,474 
Less: current portion(521)(583)
Total acquisition debt, net of current portion$3,979 $3,891 
The imputed interest expense related to our acquisition debt is as follows (in thousands):
Three months ended June 30,Six months ended June 30,
2021202220212022
Acquisition debt imputed interest expense$93 $79 $190 $159 
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 June 30,Six months ended June 30,
2021202220212022
Senior Notes interest expense$6,642 $4,230 $13,267 $8,480 
Senior Notes amortization of debt discount128 122 266 243 
Senior Notes amortization of debt premium27 — 85 — 
Senior Notes amortization of debt issuance costs53 35 127 69