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Goodwill (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Goodwill (Textual) [Abstract]        
Goodwill impairment charges $ 0 $ 0 $ 0 $ 0