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Segment Reporting (Summary of Segment Performance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 549,386 | $ 545,448 | $ 580,752 | $ 537,656 | $ 506,121 | $ 491,976 | $ 508,940 | $ 462,021 | $ 2,213,242 | $ 1,969,058 | $ 1,775,423
Income (loss) from operations | 115,347 | 117,350 | 145,594 | 113,044 | 97,808 | 100,413 | 122,564 | 92,243 | 491,335 | 413,028 | 350,239
Interest expense, net |  |  |  |  |  |  |  |  | (33,593) | (31,971) | (28,393)
Income before provision for income taxes |  |  |  |  |  |  |  |  | 457,742 | 381,057 | 321,846
Provision for income taxes |  |  |  |  |  |  |  |  | 80,695 | 117,788 | 99,792
Net income |  |  |  |  |  |  |  |  | 377,047 | 263,269 | 222,054
Less: Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 16 | 125 | 9
Net income attributable to IDEXX Laboratories, Inc. stockholders | $ 85,638 | $ 93,251 | $ 108,691 | $ 89,451 | $ 38,257 | $ 70,511 | $ 85,357 | $ 69,019 | 377,031 | 263,144 | 222,045
Depreciation and amortization |  |  |  |  |  |  |  |  | 83,178 | 83,140 | 78,218
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 115,751 | 74,384 | 64,787
CAG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,935,428 | 1,703,377 | 1,522,689
Water |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 125,198 | 114,395 | 103,579
LPD |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 130,581 | 128,481 | 126,491
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,035 | 22,805 | 22,664
Operating Segments | CAG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,935,428 | 1,703,377 | 1,522,689
Income (loss) from operations |  |  |  |  |  |  |  |  | 429,483 | 363,557 | 301,342
Depreciation and amortization |  |  |  |  |  |  |  |  | 72,789 | 71,835 | 64,878
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 103,300 | 64,759 | 56,329
Operating Segments | Water |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 125,198 | 114,395 | 103,579
Income (loss) from operations |  |  |  |  |  |  |  |  | 56,607 | 50,616 | 45,702
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,592 | 2,856 | 3,098
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 3,172 | 2,573 | 2,102
Operating Segments | LPD |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 130,581 | 128,481 | 126,491
Income (loss) from operations |  |  |  |  |  |  |  |  | 19,412 | 16,464 | 18,914
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,094 | 5,052 | 5,543
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 4,787 | 3,021 | 4,824
Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,035 | 22,805 | 22,664
Income (loss) from operations |  |  |  |  |  |  |  |  | 3,729 | 4,837 | 884
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,703 | 3,397 | 4,699
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 4,492 | 4,031 | 1,532
Unallocated Amounts |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | $ (17,896) | $ (22,446) | $ (16,603)

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