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Common Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended
Jul. 31, 2012
Jul. 23, 2012
Subsidiary, Sale of Stock [Line Items]    
Common stock sold 9,775,000  
Common Stock (Textual) [Abstract]    
Selling price per share   $ 15.40
Gross proceeds raised from the sale of common stock $ 55.8  
Net proceeds from the sale of our common stock 51.9  
Underwriting discounts and commissions 2.7  
Other offering expenses   $ 1.2
Shares were offered by the Company [Member]
   
Subsidiary, Sale of Stock [Line Items]    
Common stock sold 3,625,000  
Shares were offered by selling stockholders [Member]
   
Subsidiary, Sale of Stock [Line Items]    
Common stock sold 6,150,000