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Quarterly Financial Data (Narrative) (Details)
3 Months Ended
Dec. 31, 2019
owners
$ / shares
Sep. 30, 2019
$ / shares
Jun. 30, 2019
$ / shares
Mar. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Sep. 30, 2018
$ / shares
Jun. 30, 2018
$ / shares
Mar. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Sep. 30, 2017
$ / shares
Jun. 30, 2017
$ / shares
Mar. 31, 2017
$ / shares
Quarterly Financial Data [Abstract]                        
Restructuring charges, per share $ (0.04) $ 0.01 $ (0.02) $ (0.01) $ 0.04 $ 0.06 $ 0.06 $ 0.18 $ 0.07 $ 0.11 $ 0.04 $ 0.05
Discrete income tax adjustments, per share $ 0.06 $ 0.02 $ (0.03) $ 0.10 $ (0.01) $ 0.00 $ 0.12 $ 0.01 (0.21) 0.12 $ (0.02) $ (0.03)
Write-off of inventory (decreased)/increased earnings per share                 $ 0.01 $ (0.06)    
Number of beneficial owners, including employees owning shares through the Company's 401(k) | owners 20,000