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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 580,752 | $ 508,940 | $ 1,118,408 | $ 970,961
CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 507,487 | 439,948 | 978,320 | 843,175
Water segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 32,658 | 29,424 | 61,801 | 54,501
LPD segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 34,998 | 33,553 | 67,238 | 62,870
Other segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 5,609 | 6,015 | 11,049 | 10,415
Cag Diagnostics recurring revenue | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 437,666 | 380,319 | 843,714 | 726,999
IDEXX VetLab consumables | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 158,620 | 132,094 | 308,133 | 255,647
Rapid assay products | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 63,362 | 60,266 | 115,379 | 108,161
Reference laboratory diagnostic and consulting services | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 197,268 | 171,298 | 384,205 | 330,367
CAG Diagnostics service and accessories | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 18,416 | 16,661 | 35,997 | 32,824
CAG Diagnostics capital - instruments | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 34,544 | 27,716 | 65,439 | 53,899
Veterinary software, services and diagnostic imaging systems | CAG segment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 35,277 | $ 31,913 | $ 69,167 | $ 62,277

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