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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Activity related to unrecognized tax benefits      
Unrecognized benefits, including interest and penalties $ 24,100 $ 20,000 $ 18,900
Increase from prior period positions 1,100    
Settlement of prior year positions 400    
Gross unrecognized tax benefits at the beginning of the period 17,904 17,216 15,499
Increase in unrecognized tax benefits taken during a prior period   561  
Increase in unrecognized tax benefits taken during the current period 3,394 2,321 1,717
Lapse in statute of limitations (2) (1,673)  
Settlements (335) (521)  
Gross unrecognized tax benefits at the end of the period 20,961 17,904 17,216
Interest and penalties accrued 3,100 $ 2,100 $ 1,700
Unrecognized tax benefits that would affect the effective tax rate if recognized $ 22,300