Annual report pursuant to Section 13 and 15(d)

GOODWILL (Details)

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GOODWILL (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill at December 31, 2017 $ 368,481 $ 346,514
Goodwill acquired 204,162 25,605
Goodwill adjustments due to currency translation 204 (3,638)
Goodwill at December 31, 2019 $ 572,847 $ 368,481