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Segment Reporting (Summary Of Segment Performance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 545,448 | $ 491,976 | $ 1,663,856 | $ 1,462,937
Income (loss) from operations | 117,350 | 100,413 | 375,988 | 315,220
Interest expense, net | (8,311) | (8,364) | (25,291) | (23,849)
Income before provision for income taxes | 109,039 | 92,049 | 350,697 | 291,371
Provision for income taxes | 15,825 | 21,535 | 59,327 | 66,392
Net income | 93,214 | 70,514 | 291,370 | 224,979
Less: Net (loss) income attributable to noncontrolling interest | (37) | 3 | (23) | 92
Net income attributable to IDEXX Laboratories, Inc. stockholders | 93,251 | 70,511 | 291,393 | 224,887
CAG |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 478,097 | 426,686 | 1,456,417 | 1,269,861
Water |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 33,108 | 31,030 | 94,909 | 85,531
LPD |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 29,420 | 28,396 | 96,658 | 91,266
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 4,823 | 5,864 | 15,872 | 16,279
Operating Segments | CAG |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 478,097 | 426,686 | 1,456,417 | 1,269,861
Income (loss) from operations | 102,241 | 89,271 | 332,435 | 277,857
Operating Segments | Water |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 33,108 | 31,030 | 94,909 | 85,531
Income (loss) from operations | 15,874 | 14,505 | 43,458 | 38,421
Operating Segments | LPD |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 29,420 | 28,396 | 96,658 | 91,266
Income (loss) from operations | 4,007 | 902 | 13,439 | 9,880
Operating Segments | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 4,823 | 5,864 | 15,872 | 16,279
Income (loss) from operations | 443 | 2,114 | 2,071 | 3,275
Unallocated Amounts |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations | $ (5,215) | $ (6,379) | $ (15,415) | $ (14,213)

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