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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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) 63,058 117,551 218,524
Options shares vested (in shares) 33,573 51,286 93,117
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) $ 54.89 $ 53.26 $ 51.95
Options vested, weighted average exercise price (in dollars per share) $ 53.09 $ 48.62 $ 46.22
Share-based Compensation Arrangements by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options outstanding, aggregate intrinsic value $ 1,163 $ 4,592 $ 6,793
Options vested, aggregate intrinsic value 679 2,241 3,429
Options exercised, aggregate intrinsic value $ 2,300 $ 3,500 $ 6,200
Weighted average remaining contractual life of options outstanding (in years) 2 years 1 month 13 days    
Weighted average remaining contractual life of options vested (in years) 1 year 14 days    
Non-vested Common Stock [Member]      
Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock, Nonvested, Number of Shares [Roll Forward]      
Non-vested common shares awarded, beginning of period (in shares) 667,103 786,706 791,109
Non-vested shares that were granted during the period (in shares) 150,419 177,807 256,670
Non-vested shares that vested during period (in shares) (242,215) (194,419) (213,941)
Non-vested shares that forfeited during period (in shares) (47,700) (102,991) (47,132)
Non-vested common shares awarded, end of period (in shares) 527,607 667,103 786,706
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 $ 85.58 $ 86.95 $ 55.35
Weighted Average Grant Date Fair Value, Vested 74.85 63.07 55.87
Weighted average grant date fair value non-vested stock awards forfeited (in dollars per share) $ 75.68 $ 78.70 $ 57.86
Share-based Compensation Costs, Including Costs That May Be Recognized As Future Expense [Abstract]      
Share-based Compensation Expense Recognized $ 3,600 $ 23,200 $ 10,200
Unrecognized compensation cost of unvested awards, for future periods 14,200    
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2019 9,700    
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2020 4,300    
Unrecognized compensation cost of unvested awards, Amount to be expensed in 2021 $ 138    
Total shares awarded under executive incentive plan (in shares) 189,179    
Number of shares with required performance obligations 188,827