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Earnings Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Employee stock options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Employee stock options 130 371 668 448