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Earnings Per Share - Antidilutive Shares (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock options and restricted stock excluded in computation of diluted earning per share 66 52 366
Restricted stock shares      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock options and restricted stock excluded in computation of diluted earning per share 28 10 18