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Common Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended
May 18, 2011
Mar. 31, 2012
Mar. 31, 2011
Common Stock [Abstract]      
Public offering of common stock shares 6,037,500    
Public offering of common stock, price per share $ 10.70    
Common stock purchased by underwriters 787,500    
Net proceeds of the offering after deducting underwriting discounts, commissions and offering expenses $ 62,803 $ 1,211 $ 1,186