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Stock-Based Compensation - Schedule of Grants Issued and Grant Date Fair Value (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Grant Date Value $ 4,606,008 $ 5,540,792 $ 7,691,800