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Earnings Per Share Antidilutive Securities excluded from the Computaion of Earnings Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock Options or Restricted Stock [Member]        
Stock Option [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0    
Employee Stock Option [Member]        
Stock Option [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     3,626 0
Performance-based Restricted Shares [Member]        
Stock Option [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0    
Performance Shares [Member]        
Stock Option [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     0 0