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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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) 36,100 63,058 117,551
Options vested (in shares) 27,193 33,573 51,286
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) $ 56.75 $ 54.89 $ 53.26
Options vested, weighted average exercise price (in dollars per share) $ 57.08 $ 53.09 $ 48.62
Share-based Compensation Arrangements by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options outstanding, aggregate intrinsic value $ 1,106 $ 1,163 $ 4,592
Options vested, aggregate intrinsic value 824 679 2,241
Options exercised, aggregate intrinsic value $ 761 $ 2,300 $ 3,500
Weighted average remaining contractual life of options outstanding (in years) 1 year 9 months 3 days    
Weighted average remaining contractual life of options vested (in years) 1 year 4 months 6 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) 527,607 667,103 786,706
Non-vested shares that were granted during the period (in shares) 145,724 150,419 177,807
Non-vested shares that vested during period (in shares) (114,201) (242,215) (194,419)
Non-vested shares that forfeited during period (in shares) (131,952) (47,700) (102,991)
Non-vested shares awarded, end of period (in shares) 427,178 527,607 667,103
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 $ 76.74 $ 85.58 $ 86.95
Weighted Average Grant Date Fair Value, Vested 61.28 74.85 63.07
Weighted average grant date fair value non-vested share awards forfeited (in dollars per share) $ 83.69 $ 75.68 $ 78.70
Share-based Compensation Costs, Including Costs That May Be Recognized As Future Expense [Abstract]      
Share-based Compensation Expense Recognized $ 15,100 $ 3,600 $ 23,200
Unrecognized compensation cost of unvested awards, for future periods 14,900    
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2020 9,400    
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2021 5,300    
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2022 $ 144    
Number of shares with required performance obligations 222,164    
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) 0 0 0
Non-vested shares that were granted during the period (in shares) 46,689 0 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) 46,689 0 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 $ 87.40 $ 0 $ 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