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Earnings Per Share (Narrative) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Earning Per Share [Abstract]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0 0 0  
Share price $ 34.81 $ 36.02 $ 34.81 $ 36.02 $ 33.00