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Share-Based Compensation (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Apr. 26, 2017
shares
Apr. 24, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award          
Number of plans 4        
Share-based compensation expense | $ $ 5,891 $ 3,875 $ 8,222    
Excess Tax Benefit from Share-based Compensation, before ASU adoption | $ 1,168        
Excess Tax Benefit on Stock Plans | $ $ 0 $ 686 $ 859    
Number of stock appreciation rights outstanding (in shares) 0        
Number of stock appreciation rights granted (in shares) 0 0 0    
Valuation assumptions          
Expected volatility, minimum 25.00% 29.00% 32.00%    
Expected volatiity, maximum 26.00% 32.00% 36.00%    
Weighted-average expected volatility 26.00% 32.00% 36.00%    
Expected dividend yield, minimum 1.20% 1.30% 1.10%    
Expected dividend yield, maximum 1.30% 1.50% 1.20%    
Weighted-average expected dividend yield 1.30% 1.30% 1.20%    
Expected term, in years 5 years 5 years 5 years    
Risk-free interest rate, minimum 1.70% 1.10% 1.40%    
Risk-free interest rate, maximum 2.00% 1.40% 1.60%    
2010 Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Shares authorized for future awards (in shares)         1,500,000
Amended 2010 Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Shares authorized for future awards (in shares)         2,600,000
2017 Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Shares authorized for future awards (in shares)       1,200,000  
Shares reserved for issuance (in shares) 1,155,110        
All Plans Excluding 2010 Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Shares reserved for issuance (in shares) 742,873        
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award          
Ratio of new awards that vest each year one-third        
Vesting period of new awards granted (in years) 3 years        
Contractual term of new awards (in years) 10 years        
Weighted-average grant date fair value (in dollars per share) | $ / shares $ 16.39 $ 13.61 $ 20.08    
Total intrinsic value of stock options exercised | $ $ 4,450 $ 3,408 $ 1,702    
Aggregate intrinsic value of options outstanding | $ 28,711        
Aggregate intrinsic value of options exercisable | $ $ 25,702        
Weighted-average remaining contractual life for options outstanding (in years) 5 years 7 months 6 days        
Weighted-average remaining contractual life for options exercisable (in years) 4 years 2 months 12 days        
Unrecognized compensation cost for nonvested options | $ $ 2,064        
Compensation cost not yet recognized, weighted-average period for recognition (in years) 1 year 4 months 24 days        
Shares activity          
Outstanding at beginning of year (in shares) 1,113,382        
Granted (in shares) 224,985        
Exercised (in shares) (159,792)        
Forfeited (in shares) (42,586)        
Expired (in shares) (381)        
Outstanding at end of year (in shares) 1,135,608 1,113,382      
Exercisable at end of year (in shares) 766,583        
Weighted-Average Exercise Price          
Outstanding at beginning of year (in dollars per share) | $ / shares $ 42.34        
Granted (in dollars per share) | $ / shares 72.85        
Exercised (in dollars per share) | $ / shares 44.04        
Forfeited (in dollars per share) | $ / shares 63.98        
Expired (in dollars per share) | $ / shares 65.12        
Outstanding at end of year (in dollars per share) | $ / shares 47.47 $ 42.34      
Exercisable at end of year (in dollars per share) | $ / shares $ 39.15        
Restricted Share Awards          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period of new awards granted (in years) 3 years        
Unrecognized compensation cost for nonvested options | $ $ 1,585        
Compensation cost not yet recognized, weighted-average period for recognition (in years) 1 year 10 months        
Fair value of shares vested | $ $ 1,463 $ 1,970 1,054    
Shares activity          
Nonvested at beginning of year (in shares) 117,234        
Granted (in shares) 20,284        
Vested (in shares) (32,990)        
Forfeited (in shares) (4,739)        
Nonvested at end of year (in shares) 99,789 117,234      
Weighted-Average Exercise Price          
Nonvested at beginning of year (in dollars per share) | $ / shares $ 47.62        
Granted (in dollars per share) | $ / shares 73.06        
Vested (in dollars per share) | $ / shares 44.36        
Forfeited (in dollars per share) | $ / shares 63.43        
Nonvested at end of year (in dollars per share) | $ / shares $ 53.11 $ 47.62      
Performance Share Awards          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period of new awards granted (in years) 3 years        
Unrecognized compensation cost for nonvested options | $ $ 1,400        
Compensation cost not yet recognized, weighted-average period for recognition (in years) 2 years        
Fair value of shares vested | $ $ 1,240 $ 1,703 1,713    
Maximum increase in the number of shares of common stock a participant receives based on the achievement of performance goals (as a percent) 200.00%        
Lowest potential number of shares of common stock that could be received based on the achievement level of performance goals (in shares) 0        
Shares activity          
Nonvested at beginning of year (in shares) 129,096        
Granted (in shares) 45,792        
Vested (in shares) (20,060)        
Forfeited (in shares) (31,804)        
Nonvested at end of year (in shares) 123,024 129,096      
Weighted-Average Exercise Price          
Nonvested at beginning of year (in dollars per share) | $ / shares $ 59.30        
Granted (in dollars per share) | $ / shares 72.84        
Vested (in dollars per share) | $ / shares 61.80        
Forfeited (in dollars per share) | $ / shares 62.55        
Nonvested at end of year (in dollars per share) | $ / shares $ 63.09 $ 59.30      
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period of new awards granted (in years) 3 years        
Unrecognized compensation cost for nonvested options | $ $ 1,743        
Compensation cost not yet recognized, weighted-average period for recognition (in years) 1 year 4 months        
Fair value of shares vested | $ $ 962 $ 907      
Shares activity          
Nonvested at beginning of year (in shares) 31,038        
Granted (in shares) 30,750        
Vested (in shares) (14,638)        
Forfeited (in shares) (4,025)        
Nonvested at end of year (in shares) 43,125 31,038      
Weighted-Average Exercise Price          
Nonvested at beginning of year (in dollars per share) | $ / shares $ 60.47        
Granted (in dollars per share) | $ / shares 68.92        
Vested (in dollars per share) | $ / shares 65.74        
Forfeited (in dollars per share) | $ / shares 60.82        
Nonvested at end of year (in dollars per share) | $ / shares $ 64.67 $ 60.47      
Share-Based Liabilities          
Share-based Compensation Arrangement by Share-based Payment Award          
Total share-based liabilities | $ $ 175 $ 155      
Amounts paid out related to share-based liability awards | $ $ 45 $ 62 $ 53