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Stock Award Plans, All Plans Options and Restricted Stock Award Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Plans Combined Disclosure [Abstract]      
Intrinsic value of stock options exercised $ 745,000 $ 1,655,000 $ 6,709,000
Tax benefit from stock options exercised 210,000 410,000 2,073,000
Intrinsic value of restricted stock vesting 5,649,000 5,917,000 12,936,000
Tax benefit from restricted stock vesting $ 1,590,000 $ 1,464,000 $ 3,997,000
Fair value of stock options granted (in dollars per share) $ 20.19 $ 22.77 $ 23.53
Fair value of stock options granted $ 2,314,000 $ 2,666,000 $ 2,787,000
Employee Stock Award Plan [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Intrinsic value of restricted stock vesting 5,172,000 1,727,000  
Tax benefit from restricted stock vesting 1,455,000 $ 427,000  
Stock Options [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Unrecognized compensation cost related to unvested awards $ 2,136,000    
Weighted average period of recognition in years 1 year 8 months 12 days    
Fair Value Assumptions [Abstract]      
Dividend yield 0.00% 0.00% 0.00%
Average risk-free interest rate 1.30% 2.50% 2.70%
Stock price volatility 28.00% 28.00% 27.00%
Estimated option term 5 years 3 months 18 days 5 years 3 months 18 days 5 years 6 months
Restricted Stock [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Unrecognized compensation cost related to unvested awards $ 1,468,000    
Weighted average period of recognition in years 7 months 6 days    
Restricted Stock [Member] | Employee Stock Award Plan [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Vesting (in shares) 48,450    
RSUs [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Vesting (in shares)     0
Unrecognized compensation cost related to unvested awards $ 13,298,000    
Weighted average period of recognition in years 3 years 3 months 18 days    
RSUs [Member] | Employee Stock Award Plan [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Vesting (in shares) 64,039