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, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Carrying amount of goodwill in foreign countries $ 54,900 $ 46,300
Changes in the carrying amount of goodwill    
Goodwill balance at the beginning of the period 346,514 255,665
Goodwill acquired 25,605 87,261
Goodwill adjustments due to currency translation (3,638) 3,588
Goodwill balance at the end of the period $ 368,481 $ 346,514