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Stock-Based Compensation Plans (Details) - The 2007 plan - shares
6 Months Ended
Jun. 30, 2015
May. 24, 2007
Stock-based compensation plans    
Number of shares authorized 2,800,000 2,000,000
Additional shares authorized 800,000  
Restricted stock    
Stock-based compensation plans    
Number of shares awarded 2,138,712  
Number of shares available 135,368  
Restricted stock, forfeited, and returned to pool 796,656