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Share-Based Compensation (Details 2) (USD $)
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Stock Options
   
Weighted-average assumptions    
Dividend yield (as a percent) 1.70% 2.10%
Expected life 6 years 6 years
Expected volatility (as a percent) 42.00% 46.00%
Risk-free interest rate (as a percent) 1.02% 1.06%
Additional disclosures    
Total unrecognized compensation cost related to non vested stock option grants $ 562,000  
Weighted-average period over which unrecognized compensation cost is expected to be recognized 1 year 2 months 16 days  
Total fair value of shares vested during the period 402,000  
Restricted Stock
   
Additional disclosures    
Weighted-average period over which unrecognized compensation cost is expected to be recognized 3 years 1 month 10 days  
Restricted Stock Activity and RSUs    
Nonvested at the beginning of the period (in shares) 172,847  
Granted (in shares) 78,004  
Vested (in shares) (13,800)  
Forfeited (in shares) (650)  
Nonvested at the end of the period (in shares) 236,401  
Weighted-Average Grant-Date Fair Value    
Nonvested at the beginning of the period (in dollars per share) $ 30.84  
Granted (in dollars per share) $ 42.24  
Vested (in dollars per share) $ 33.05  
Forfeited (in dollars per share) $ 39.16  
Nonvested at the end of the period (in dollars per share) $ 34.45  
Additional disclosures    
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted 5,200,000  
Total fair value of restricted shares vested during the period 760,000  
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 2 years 2 months 5 days  
Target RSU award level (as a percent) 72.70%  
Restricted Stock Activity and RSUs    
Granted (in shares) 43,820  
Nonvested at the end of the period (in shares) 43,820  
Weighted-Average Grant-Date Fair Value    
Granted (in dollars per share) $ 51.01  
Nonvested at the end of the period (in dollars per share) $ 51.01  
Additional disclosures    
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted $ 1,900,000  
Performance period 3 years