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STOCK AWARD PLANS, All Plans Options and Restricted Stock Award Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Stock Options [Member]      
Share based Compensation Plans Combined Disclosure [Abstract]      
Intrinsic value of stock options exercised   $ 6,623 $ 1,530
Tax benefit from stock options exercised   1,974 555
Unrecognized compensation cost related to unvested awards $ 3,245 $ 3,245  
Weighted average period of recognition in years   2 years  
Fair value of options vested   $ 3,143 $ 2,492
Fair value of stock options granted (in dollars per share)   $ 23.53 $ 20.73
Fair value of stock options granted   $ 2,787 $ 2,594
Fair Value Assumptions [Abstract]      
Dividend yield   0.00% 0.00%
Average risk-free interest rate   2.70% 2.00%
Stock price volatility   27.00% 27.00%
Estimated option term   6 years 6 years
Restricted Stock [Member]      
Share based Compensation Plans Combined Disclosure [Abstract]      
Intrinsic value of restricted stock vesting   $ 11,406 $ 7,015
Tax benefit from restricted stock vesting   3,399 2,546
Unrecognized compensation cost related to unvested awards 12,484 $ 12,484  
Weighted average period of recognition in years   2 years 6 months  
Fair value of restricted stock vested   $ 11,406 $ 7,015
RSUs [Member]      
Share based Compensation Plans Combined Disclosure [Abstract]      
Vesting (in shares)   0  
Unrecognized compensation cost related to unvested awards $ 6,786 $ 6,786  
Weighted average period of recognition in years 4 years 4 months 24 days