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Segment Reporting Detail 2 (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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