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INCOME TAX - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
 7 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
May 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Balance at the beginning of the year $ 7,803 $ 31,218 $ 17,916 $ 2,559
Additions based on income tax positions related to the current year 4,626 0 7,537 287
Additions related to acquisition 6,149 0 13,061 6,151
Additions for income tax positions of prior years 247 0 411 753
Effect of foreign currency fluctuations on income tax positions (3) 0 27 2
Reductions for income tax positions of prior years (906) (10,021) (7,285) (123)
Settlements with income tax authorities 0 0 (449) (1,826)
Balance at the end of the year $ 17,916 $ 21,197 $ 31,218 $ 7,803