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Earnings Per Share Anti-dilutive Awards Excluded from Calculation (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 770 1,022 760 646