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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock Options [Member]      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]      
Number of options outstanding, Ending balance (in shares) 17,671 36,100 63,058
Options vested (in shares) 17,671 27,193 33,573
Share-based Compensation Arrangements by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]      
Options outstanding, weighted average exercise price, ending balance (in dollars per share) $ 57.35 $ 56.75 $ 54.89
Options vested, weighted average exercise price (in dollars per share) $ 57.35 $ 57.08 $ 53.09
Share-based Compensation Arrangements by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options outstanding, aggregate intrinsic value $ 197 $ 1,106 $ 1,163
Options vested, aggregate intrinsic value 197 824 679
Options exercised, aggregate intrinsic value $ 318 $ 761 $ 2,300
Weighted average remaining contractual life of options outstanding (in years) 1 year 10 days    
Weighted average remaining contractual life of options vested (in years) 1 year 10 days    
Restricted Stock [Member]      
Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock, Nonvested, Number of Shares [Roll Forward]      
Non-vested shares awarded, beginning of period (in shares) 427,178 527,607 667,103
Non-vested shares that were granted during the period (in shares) 236,750 145,724 150,419
Non-vested shares that vested during period (in shares) (225,527) (114,201) (242,215)
Non-vested shares that forfeited during period (in shares) (18,167) (131,952) (47,700)
Non-vested shares awarded, end of period (in shares) 420,234 427,178 527,607
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted Average Grant Date Fair Value, Granted $ 83.49 $ 76.74 $ 85.58
Weighted Average Grant Date Fair Value, Vested 83.50 61.28 74.85
Weighted average grant date fair value non-vested share awards forfeited (in dollars per share) $ 83.10 $ 83.69 $ 75.68
Share-based Compensation Costs, Including Costs That May Be Recognized As Future Expense [Abstract]      
Share-based Compensation Expense Recognized $ 16,000 $ 15,100 $ 3,600
Unrecognized compensation cost of unvested awards, for future periods 16,300    
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2021 10,800    
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2022 5,400    
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2023 $ 134    
Number of shares with required performance obligations 244,392    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock, Nonvested, Number of Shares [Roll Forward]      
Non-vested shares awarded, beginning of period (in shares) 46,689 0 0
Non-vested shares that were granted during the period (in shares) 22,980 46,689 0
Non-vested shares that vested during period (in shares) 0 0 0
Non-vested shares that forfeited during period (in shares) 0 0 0
Non-vested shares awarded, end of period (in shares) 69,669 46,689 0
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted Average Grant Date Fair Value, Granted $ 77.36 $ 87.40 $ 0
Weighted Average Grant Date Fair Value, Vested 0 0 0
Weighted average grant date fair value non-vested share awards forfeited (in dollars per share) $ 0 $ 0 $ 0