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Share-Based Compensation (Details 2) - USD ($)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Stock Options    
Weighted-average assumptions    
Dividend yield (as a percent) 1.40% 1.27%
Expected life 8 years 6 months 6 years 3 months 18 days
Risk-free interest rate (as a percent) 1.79% 2.10%
Additional disclosures    
Total unrecognized compensation cost related to non vested stock option grants $ 1,000,000  
Weighted-average period over which unrecognized compensation cost is expected to be recognized 1 year 3 months 26 days  
Total fair value of shares vested during the period $ 386,000  
Stock Options | Minimum    
Weighted-average assumptions    
Expected volatility (as a percent) 40.90% 43.80%
Stock Options | Maximum    
Weighted-average assumptions    
Expected volatility (as a percent)   44.70%
Restricted Stock    
Additional disclosures    
Weighted-average period over which unrecognized compensation cost is expected to be recognized 2 years 2 months 9 days  
Restricted Stock Activity and RSUs    
Nonvested at the beginning of the period (in shares) 228,907  
Granted (in shares) 42,605  
Vested (in shares) (44,444)  
Forfeited (in shares) (1,500)  
Nonvested at the end of the period (in shares) 225,568  
Weighted-Average Grant-Date Fair Value    
Nonvested at the beginning of the period (in dollars per share) $ 37.44  
Granted (in dollars per share) 70.56  
Vested (in dollars per share) 36.49  
Forfeited (in dollars per share) 49.46  
Nonvested at the end of the period (in dollars per share) $ 43.80  
Additional disclosures    
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted $ 5,300,000  
Total fair value of restricted shares vested during the period $ 1,700,000  
Restricted Stock | Employees | Minimum    
Additional disclosures    
Vesting period 4 years  
Restricted Stock | Non-employee directors | Maximum    
Additional disclosures    
Vesting period 12 months  
Restricted Stock Units    
Additional disclosures    
Weighted-average period over which unrecognized compensation cost is expected to be recognized 1 year 3 months 4 days  
Restricted Stock Activity and RSUs    
Nonvested at the beginning of the period (in shares) 79,308  
Granted (in shares) 38,456  
Vested (in shares) (2,315)  
Nonvested at the end of the period (in shares) 115,449  
Weighted-Average Grant-Date Fair Value    
Nonvested at the beginning of the period (in dollars per share) $ 55.92  
Granted (in dollars per share) 68.10  
Vested (in dollars per share) 54.00  
Nonvested at the end of the period (in dollars per share) $ 60.02  
Additional disclosures    
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted $ 3,200,000  
Total fair value of restricted shares vested during the period $ 125,000  
Performance period 3 years  
Target RSU award level (as a percent) 94.00%