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INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income tax expense $ 7,653 $ 10,470  
Effective tax rate 20.10% 30.00%  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 400 $ 1,100  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent     21.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 2,900   $ 2,900