Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Components of Stock-Based Compensation (Details)

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STOCKHOLDERS' EQUITY - Components of Stock-Based Compensation (Details) - Time lapse restricted stock - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense $ 3,277 $ 3,107 $ 6,370 $ 6,375
Tax benefit (717) (1,202) (1,503) (2,467)
Restricted stock expense, net of tax $ 2,560 $ 1,905 $ 4,867 $ 3,908