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Earnings Per Share (Antidilutive Effect on Weighted Average Shares) (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Employee equity incentive plans (in shares) 271 4,587 7 4,486