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BUSINESS COMBINATIONS - Summary of Goodwill Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in goodwill [abstract]    
Balance at beginning of year $ 104,846 $ 98,926
Additions related to new acquisitions 83,706 6,244
Translation (14) (324)
Balance at end of year $ 188,538 $ 104,846