Quarterly report pursuant to Section 13 or 15(d)

EQUITY AND EARNINGS PER SHARE - Assumptions for Valuation of Options (Details)

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EQUITY AND EARNINGS PER SHARE - Assumptions for Valuation of Options (Details) - USD ($)
$ in Thousands
Apr. 10, 2018
Jan. 01, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair Value at Valuation Date $ 3,558 $ 4,272
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Volatility 35.66% 39.73%
Expected Dividend Yield 0.00% 0.00%
Risk-Free Rate, lower range 2.68% 2.16%
Risk-Free Rate, upper range 2.82% 2.29%
Stock options | Lower Range    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Remaining Term 2 years 8 months 12 days 3 years
Stock options | Upper Range    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Remaining Term 6 years 3 months 18 days 6 years 7 months 6 days