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Revenue Recognition (Disaggregation of Revenue by Major Product and Service Categories) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 620,103 | $ 580,752 | $ 1,196,159 | $ 1,118,408
CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 547,349 | 507,487 | 1,056,267 | 978,320
Water segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 34,764 | 32,658 | 65,074 | 61,801
LPD segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 33,104 | 34,998 | 64,610 | 67,238
Other segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 4,886 | 5,609 | 10,208 | 11,049
Cag Diagnostics recurring revenue | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 477,431 | 437,666 | 921,222 | 843,714
IDEXX VetLab consumables | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 175,159 | 158,620 | 342,370 | 308,133
Rapid assay products | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 68,605 | 63,362 | 123,036 | 115,379
Reference laboratory diagnostic and consulting services | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 213,892 | 197,268 | 416,550 | 384,205
CAG Diagnostics services and accessories | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 19,775 | 18,416 | 39,266 | 35,997
CAG Diagnostics capital - instruments | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 31,526 | 34,544 | 60,275 | 65,439
Veterinary software, services and diagnostic imaging systems | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 38,392 | $ 35,277 | $ 74,770 | $ 69,167

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