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BUSINESS SEGMENTS - Reconciles segment gross profit to net income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
BUSINESS SEGMENTS    
Segment gross profit $ 19,835 $ 15,286
Selling, general and administrative expenses (13,310) (13,201)
Payroll support program proceeds (6,363)  
Transaction costs   (231)
Interest expense, net (258) (536)
Other income, net 94 57
Change in fair value of warrant liability (224)  
Income tax expense (2,482) (316)
Net income $ 10,018 $ 1,059