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Earnings (Loss) Per Share (Narrative) (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Antidilutive share options excluded from computation of diluted earnings per share (in shares) 400,000 1,600,000 300,000 1,700,000