Annual report pursuant to Section 13 and 15(d)

Earnings per Share (Narrative) (Details)

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Earnings per Share (Narrative) (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]      
Antidilutive securities excluded from computation of earnings per share, number of shares 405,928 372,516 928,443