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Stock Award Plans, All Plans Options and Restricted Stock Award Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Plans Combined Disclosure [Abstract]      
Intrinsic value of stock options exercised $ 115,000 $ 745,000 $ 1,655,000
Tax benefit from stock options exercised 32,000 210,000 410,000
Intrinsic value of restricted stock vesting 5,344,000 5,649,000 5,917,000
Tax benefit from restricted stock vesting 1,500,000 $ 1,590,000 $ 1,464,000
Fair value of stock options granted (in dollars per share)   $ 20.19 $ 22.77
Fair value of stock options granted 0 $ 2,314,000 $ 2,666,000
Employee Stock Award Plan [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Intrinsic value of restricted stock vesting 4,419,000 5,172,000 1,727,000
Tax benefit from restricted stock vesting 1,240,000 $ 1,455,000 $ 427,000
Stock Options [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Unrecognized compensation cost related to unvested awards $ 684,000    
Weighted average period of recognition in years 7 months 6 days    
Fair Value Assumptions [Abstract]      
Dividend yield   0.00% 0.00%
Average risk-free interest rate   1.30% 2.50%
Stock price volatility   28.00% 28.00%
Estimated option term   5 years 3 months 18 days 5 years 3 months 18 days
Restricted Stock [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Unrecognized compensation cost related to unvested awards $ 180,000    
Weighted average period of recognition in years 1 month 6 days    
Restricted Stock [Member] | Employee Stock Award Plan [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Vesting (in shares) 65,037    
RSUs [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Unrecognized compensation cost related to unvested awards $ 19,443,000    
Weighted average period of recognition in years 3 years 1 month 6 days    
RSUs [Member] | Employee Stock Award Plan [Member]      
Share-based Compensation Plans Combined Disclosure [Abstract]      
Vesting (in shares) 83,304