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Stock-based Compensation (Details) (USD $)
3 Months Ended
Sep. 30, 2013
Stock-Based Compensation Details  
Dividend yield 3.67%
Expected stock price volatility 25.31%
Risk-free interest rate 1.23%
Expected option life (in years) 3 years 9 months 18 days
Weighted average fair value per share of options granted $ 3.777