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Quarterly Financial Data (Narrative) (Details) | 3 Months Ended
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Dec. 31, 2017 owners $ / shares | Sep. 30, 2017 $ / shares | Jun. 30, 2017 $ / shares | Mar. 31, 2017 $ / shares | Dec. 31, 2016 $ / shares | Sep. 30, 2016 $ / shares | Jun. 30, 2016 $ / shares | Mar. 31, 2016 $ / shares | Dec. 31, 2015 $ / shares | Sep. 30, 2015 $ / shares | Jun. 30, 2015 $ / shares | Mar. 31, 2015 $ / shares
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges, per share | $ 0.07 | $ 0.11 | $ 0.04 | $ 0.05 | $ 0.01 | $ 0.01 | $ 0.13 | $ 0.01 | $ 0.21 | $ 0.07 | $ 0.02 | $ 0.18
Business acquistion adjustment decreased earing, per share |  |  |  |  | 0.00 | 0.03 |  |  |  |  |  |
Costs related the acquisition transaction reduced earnings per share |  |  |  |  | 0.00 | 0.00 | 0.08 | 0.03 |  |  |  |
Discrete income tax adjustments, per share | $ (0.21) | $ 0.12 | $ (0.02) | $ (0.03) | $ 0.04 | $ 0.00 | $ 0.00 | $ 0.03 | $ 0.85 | $ (0.15) | $ 0.00 | (0.01)
Gain related to the sale of investment, per share |  |  |  |  |  |  |  |  |  |  |  | $ 0.02
Write-off of inventory (decreased)/increased earnings per share | 1.00% | (6.00%) |  |  |  |  |  |  |  |  |  |
Number of beneficial owners, including employees owning shares through the Company's 401(k) | owners | 20,000 |  |  |  |  |  |  |  |  |  |  |
Earnings per share | $ 0.01 |  |  |  |  |  |  |  |  |  |  |

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