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INCOME TAXES - Tax Cuts and Jobs Act (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
INCOME TAXES      
Federal statutory rate (as a percent) 21.00% 35.00% 35.00%
Provisional charge, revaluated net deferred tax assets   $ 39,763  
Provision related to deemed mandatory repatriation $ 1,800 $ 2,100