Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 1)

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Stock-Based Compensation (Details 1) (USD $)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Estimated stock option on the date of grant fair value    
Dividend yield 2.47% 2.36%
Expected life in years 7 years 7 years
Expected volatility 41.53% 41.02%
Risk-free interest rate 1.24% 2.71%
Weighted average fair value per option granted $ 4.76 $ 4.31