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Segment Reporting (Summary Of Segment Performance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 491,976 | $ 448,308 | $ 1,462,937 | $ 1,332,427
Income (loss) from operations | 100,413 | 88,459 | 315,220 | 266,414
Interest expense, net | (8,364) | (6,935) | (23,849) | (21,695)
Income before provision for income taxes | 92,049 | 81,524 | 291,371 | 244,719
Provision for income taxes | 21,535 | 25,072 | 66,392 | 75,036
Net income | 70,514 | 56,452 | 224,979 | 169,683
Less: Net income attributable to noncontrolling interest | 3 | (3) | 92 | 7
Net income attributable to IDEXX Laboratories, Inc. stockholders | 70,511 | 56,455 | 224,887 | 169,676
Depreciation and amortization |  |  | 61,620 | 57,977
Expenditures for long-lived assets |  |  | 54,370 | 49,956
CAG Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 426,686 | 385,288 | 1,269,861 | 1,143,150
Income (loss) from operations | 89,271 | 77,493 | 277,857 | 229,858
Water Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 31,030 | 27,862 | 85,531 | 79,243
Income (loss) from operations | 14,505 | 12,442 | 38,421 | 34,864
LPD Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 28,396 | 29,799 | 91,266 | 93,511
Income (loss) from operations | 902 | 3,026 | 9,880 | 12,665
Other Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 5,864 | 5,359 | 16,279 | 16,523
Income (loss) from operations | 2,114 | 1,008 | 3,275 | (749)
Unallocated Amounts [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations | $ (6,379) | $ (5,510) | $ (14,213) | $ (10,224)

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