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Segment Reporting (Summary Of Segment Performance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 466,569 | $ 413,343 | $ 884,119 | $ 795,820
Income (loss) from operations | 104,162 | 88,303 | 177,955 | 161,106
Interest expense, net | (7,276) | (6,700) | (14,760) | (12,579)
Income before provision for income taxes | 96,886 | 81,603 | 163,195 | 148,527
Provision for income taxes | 29,680 | 24,665 | 49,964 | 45,011
Net income | 67,206 | 56,938 | 113,231 | 103,516
Less: Net income attributable to noncontrolling interest | 4 | 26 | 10 | 10
Net income attributable to IDEXX Laboratories, Inc. stockholders | 67,202 | 56,912 | 113,221 | 103,506
Depreciation and amortization |  |  | 38,210 | 32,944
Expenditures for long-lived assets |  |  | 37,868 | 46,873
CAG Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 400,223 | 351,620 | 757,862 | 676,151
Income (loss) from operations | 91,019 | 68,085 | 152,397 | 121,603
Water Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 27,829 | 25,051 | 51,381 | 46,749
Income (loss) from operations | 12,743 | 11,951 | 22,422 | 21,312
LPD Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 32,856 | 32,059 | 63,712 | 63,329
Income (loss) from operations | 5,069 | 6,579 | 9,639 | 13,535
Other Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 5,661 | 4,613 | 11,164 | 9,591
Income (loss) from operations | (920) | (933) | (1,757) | (1,255)
Unallocated Amounts [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations | $ (3,749) | $ 2,621 | $ (4,746) | $ 5,911

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