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DEFINED CONTRIBUTION PLAN (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items]      
Employer matching contribution, percent of match 50.00%    
Employers matching contribution, annual vesting percentage 25.00%    
Vesting period 4 years    
Cost recognized $ 5.8 $ 3.9 $ 1.7
Minimum      
Defined Contribution Plan Disclosure [Line Items]      
Maximum annual contributions per employee, percent 1.00%    
Maximum      
Defined Contribution Plan Disclosure [Line Items]      
Maximum annual contributions per employee, percent 100.00%