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Revenue Recognition (Disaggregation of Revenue by Major Product and Service Categories) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 545,448 | $ 491,976 | $ 1,663,856 | $ 1,462,937
CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 478,097 | 426,686 | 1,456,417 | 1,269,861
Water segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 33,108 | 31,030 | 94,909 | 85,531
LPD segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 29,420 | 28,396 | 96,658 | 91,266
Other segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 4,823 | 5,864 | 15,872 | 16,279
Cag Diagnostics recurring revenue | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 409,162 | 364,937 | 1,252,876 | 1,091,936
IDEXX VetLab consumables | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 152,509 | 129,434 | 460,642 | 385,081
Rapid assay products | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 53,821 | 50,924 | 169,200 | 159,085
Reference laboratory diagnostic and consulting services | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 184,103 | 167,851 | 568,308 | 498,218
CAG Diagnostics service and accessories | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 18,729 | 16,728 | 54,726 | 49,552
CAG Diagnostics capital - instruments | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 31,561 | 29,119 | 97,000 | 83,018
Veterinary software, services and diagnostic imaging systems | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 37,374 | $ 32,630 | $ 106,541 | $ 94,907

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