Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Details)

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STOCKHOLDERS' EQUITY (Details) - Time Lapse Restricted Shares and Restricted Stock Units - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense $ 3,660 $ 3,049 $ 10,030 $ 9,406
Tax benefit (947) (1,180) (2,455) (3,640)
Restricted stock expense, net of tax $ 2,713 $ 1,869 $ 7,575 $ 5,766