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Earnings Per Share - Antidilutive Securities (Details) (Stock options)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock options
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive stock options 795,133 2,283,840 2,128,906