Quarterly report pursuant to Section 13 or 15(d)

Capital Stock (Details)

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Capital Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended
Sep. 30, 2012
May 31, 2012
Dec. 31, 2011
Oct. 31, 2012
Subsequent event
Common stock
Capital Stock        
Common stock authorized, before amendment (in shares)   100,000,000    
Common stock authorized (in shares) 200,000,000 200,000,000 100,000,000  
Capital Stock        
Common stock sold upon completion of underwritten public offering (in shares)       15,237,750
Sale price of common stock (in dollars per share)       $ 9.50
Net proceeds of public offering after deducting underwriting discounts and commissions and offering expenses       $ 135.7