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INCOME TAXES - Reconciliation of Beginning and Ending Balances of Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of period $ 19,150 $ 22,671 $ 23,972
Additions based on tax positions related to the current year 978 452 80
Additions for tax positions of prior years 174 238 110
Additions for acquired uncertain tax benefits 0 0 387
Reductions for change in U.S. federal tax rate 0 (2,424) 0
Reductions for tax positions of prior years (2,145) (1,500) (1,541)
Reductions for a lapse of the applicable statute of limitations 0 (287) (337)
Balance at end of period $ 18,157 $ 19,150 $ 22,671