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GOODWILL (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
The changes in the carrying amount of goodwill

The changes in the carrying amount of goodwill for the twelve months ended December 31, 2020 and 2019 were as follows:

GOODWILL
(in thousands)     
Goodwill at December 31, 2018  $368,481 
Goodwill acquired   204,162 
Goodwill adjustments due to currency translation   204 
Goodwill at December 31, 2019   572,847 
Goodwill acquired   73,430 
Goodwill adjustments due to currency translation   6,899 
Goodwill at December 31, 2020  $653,176