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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
Mar. 31, 2019
Mar. 31, 2018
Stock Options [Member]    
Share based Compensation Plans Combined Disclosure [Abstract]    
Intrinsic value of stock options exercised $ 438 $ 2,051
Tax benefit from stock options exercised 105 478
Unrecognized compensation cost related to unvested awards $ 3,546  
Weighted average period of recognition in years 2 years  
Fair value of options vested $ 1,842 $ 2,489
Fair value of stock options granted (in dollars per share) $ 22.41 $ 23.37
Fair value of stock options granted $ 2,414 $ 2,706
Fair Value Assumptions [Abstract]    
Dividend yield 0.00% 0.00%
Average risk-free interest rate 2.50% 2.70%
Stock price volatility 28.00% 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 $ 4,222 $ 8,764
Tax benefit from restricted stock vesting 1,007 2,042
Unrecognized compensation cost related to unvested awards $ 7,126  
Weighted average period of recognition in years 2 years 2 months 12 days  
Fair value of restricted stock vested $ 4,222 $ 8,764
RSUs [Member]    
Share based Compensation Plans Combined Disclosure [Abstract]    
Intrinsic value of stock options exercised 1,653  
Tax benefit from restricted stock vesting 394  
Vesting (in shares)   0
Unrecognized compensation cost related to unvested awards $ 12,206  
Weighted average period of recognition in years 4 years 3 months 18 days  
Fair value of restricted stock vested $ 1,653