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CREDIT FACILITY AND ACQUISITION DEBT (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
The interest expense and amortization of debt issuance costs related to our Credit Facility during the three and six months ended June 30, 2019 and 2020 is as follows (in thousands):
 
Three months ended June 30,
 
Six months ended June 30,
 
2019

 
2020

 
2019

 
2020

Credit Facility interest expense
$
362

 
$
1,106

 
$
740

 
$
2,336

Credit Facility amortization of debt issuance costs
54

 
118

 
108

 
245


Our Credit Facility and Acquisition debt consisted of the following at December 31, 2019 and June 30, 2020 (in thousands):
 
December 31, 2019

 
June 30, 2020

Credit Facility
$
83,800

 
$
89,700

Debt issuance costs, net of accumulated amortization of $337 and $582, respectively
(1,618
)
 
(1,373
)
Total Credit Facility
$
82,182

 
$
88,327

 
 
 
 
Acquisition debt
$
6,964

 
$
6,427

Less: current portion
(1,306
)
—

(1,142
)
Total acquisition debt, net of current portion
$
5,658

 
$
5,285


The imputed interest expense related to our acquisition debt during the three and six months ended June 30, 2019 and 2020 is as follows (in thousands):
 
Three months ended June 30,
 
Six months ended June 30,
 
2019

 
2020

 
2019

 
2020

Acquisition debt imputed interest expense
$
161

 
$
124

 
$
329

 
$
251