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Segment Reporting (Summary Of Segment Performance) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Revenue | $ 537,656 | $ 462,021
Income (loss) from operations | 113,044 | 92,243
Interest expense, net | (8,695) | (7,506)
Income before provision for income taxes | 104,349 | 84,737
Provision for income taxes | 14,873 | 15,679
Net income | 89,476 | 69,058
Less: Net income attributable to noncontrolling interest | 25 | 39
Net income attributable to IDEXX Laboratories, Inc. stockholders | 89,451 | 69,019
Depreciation and amortization | 20,804 | 20,307
Expenditures for long-lived assets | 23,726 | 23,647
CAG Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 470,833 | 403,227
Income (loss) from operations | 100,398 | 79,855
Water Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 29,143 | 25,077
Income (loss) from operations | 12,462 | 10,263
LPD Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 32,240 | 29,317
Income (loss) from operations | 2,961 | 3,802
Other Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 5,440 | 4,400
Income (loss) from operations | 498 | 393
Unallocated Amounts [Member] |  |
Segment Reporting Information [Line Items] |  |
Income (loss) from operations | $ (3,275) | $ (2,070)

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