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Acquisition - Pro forma information (Details) - Dispensing Systems [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition [Line Items] |  |  |  |
Business acquisition, pro forma revenue | $ 1,029,398 | $ 1,026,040 | $ 1,981,187 | $ 1,963,011
Business acquisition, pro forma net income | $ 42,089 | $ 41,430 | $ 80,846 | $ 48,851
Business acquisition, pro forma earnings per share, basic (in dollars per share) | $ 0.38 | $ 0.34 | $ 0.73 | $ 0.40
Business acquisition, pro forma earnings per share, diluted (in dollars per share) | $ 0.38 | $ 0.34 | $ 0.73 | $ 0.40

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