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Segment Reporting (Summary Of Segment Performance) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Revenue | $ 462,021 | $ 417,550
Income (loss) from operations | 92,243 | 73,793
Interest expense, net | (7,506) | (7,484)
Income before provision for income taxes | 84,737 | 66,309
Provision for income taxes | 15,679 | 20,284
Net income | 69,058 | 46,025
Less: Net income attributable to noncontrolling interest | 39 | 6
Net income attributable to IDEXX Laboratories, Inc. stockholders | 69,019 | 46,019
Depreciation and amortization | 20,307 | 18,546
Expenditures for long-lived assets | 23,647 | 21,906
CAG Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 403,227 | 357,639
Income (loss) from operations | 79,855 | 61,378
Water Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 25,077 | 23,552
Income (loss) from operations | 10,263 | 9,679
LPD Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 29,317 | 30,856
Income (loss) from operations | 3,802 | 4,570
Other Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 4,400 | 5,503
Income (loss) from operations | 393 | (837)
Unallocated Amounts [Member] |  |
Segment Reporting Information [Line Items] |  |
Income (loss) from operations | $ (2,070) | $ (997)

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