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CREDIT FACILITY AND ACQUISITION DEBT (Tables)
 3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
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 
Schedule of Line of Credit Facilities he interest expense and amortization of debt issuance costs related to our Credit Facility are as follows (in thousands):
Three months ended March 31,
20212022
Credit Facility interest expense$445 $847 
Credit Facility amortization of debt issuance costs118 88