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Segment Reporting Detail 2 (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Sales Information |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 778,031 | $ 698,799 | $ 653,656 | $ 594,567 | $ 709,699 | $ 650,598 | $ 608,286 | $ 539,674 | $ 2,725,053 | $ 2,508,257 | $ 2,395,447
Laboratory Product and Service Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Sales Information |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 1,358,493 | 1,225,000 | 1,154,905
Industrial Product and Service Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Sales Information |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 1,158,335 | 1,067,858 | 1,034,310
Retail Product and Service Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Sales Information |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | $ 208,225 | $ 215,399 | $ 206,232

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