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Segment Reporting (Summary Of Segment Performance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 406,387 | $ 383,523 | $ 1,202,207 | $ 1,133,848
Income (loss) from operations | 71,895 | 72,189 | 233,001 | 225,454
Interest expense, net | (7,066) | (3,981) | (19,645) | (8,761)
Income before provision for income taxes | 64,829 | 68,208 | 213,356 | 216,693
Provision for income taxes | 20,600 | 16,045 | 65,611 | 60,693
Net income | 44,229 | 52,163 | 147,745 | 156,000
Less: Net loss attributable to noncontrolling interest | 6 | 21 | 16 | 55
Net income attributable to IDEXX Laboratories, Inc. stockholders | 44,223 | 52,142 | 147,729 | 155,945
CAG Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 344,081 | 317,309 | 1,020,232 | 938,166
Income (loss) from operations | 61,541 | 60,176 | 181,845 | 181,104
Water Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 25,957 | 25,747 | 72,706 | 71,655
Income (loss) from operations | 12,408 | 11,367 | 33,821 | 29,547
LPD Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 30,448 | 33,063 | 93,777 | 104,581
Income (loss) from operations | 5,562 | 6,319 | 17,408 | 25,385
Other Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 5,901 | 7,404 | 15,492 | 19,446
Income (loss) from operations | 635 | 794 | 204 | 1,134
Unallocated Amounts [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations | $ (8,251) | $ (6,467) | $ (277) | $ (11,716)

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