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Preferred Stock (Details) (USD $)
 1 Months Ended
Mar. 31, 2009
right
Sep. 30, 2012
Dec. 31, 2011
Mar. 18, 2009
USDperunit
Preferred Stock        
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock 1      
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01 $ 0.01
Number of shares of Series A Junior Participating Preferred Stock that each right entitles the registered holder to purchase       0.001
Par value of Series A Junior Participating Preferred Stock (in dollars per share)   $ 0.01 $ 0.01 $ 0.01
Purchase price of Series A Junior Participating Preferred Stock (in dollars per one one-thousandth of a share)       25