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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]  
Disclosure of Share-based Compensation Arrangements, Assumptions Used

The following weighted average assumptions were used to value options granted in the periods indicated.

 

 

 

 

 

 

 

 

 

2013

2012

2011

Expected life of options

7 years

7 years

7 years

Risk-free interest rate

1.41%

1.78%

1.39%

Expected volatility

21.57%

22.12%

21.91%

Expected dividend yield

4.91%

4.86%

4.62%