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Earnings Per Share - Narrative (Details) - Stock options
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Antidilutive securities excluded from computation (in shares) | shares 1,000
Weighted average exercise price of stock options (in dollars per share) | $ / shares $ 30.45