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Summary of Quarterly Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Data | A summary of quarterly data (1) follows:
(in thousands, except per share data) |  | For the Three Months Ended
﻿ |  | March 31, |  | June 30, |  | September 30, |  | December 31,
﻿ |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 576,056 |  |  | $ | 620,103 |  |  | $ | 605,303 |  |  | $ | 605,446 |
Gross profit |  | $ | 331,597 |  |  | $ | 357,853 |  |  | $ | 344,950 |  |  | $ | 331,149 |
Operating income |  | $ | 133,138 |  |  | $ | 164,275 |  |  | $ | 139,802 |  |  | $ | 115,631 |
Net income attributable to IDEXX Laboratories, Inc. stockholders |  | $ | 102,681 |  |  | $ | 125,706 |  |  | $ | 108,837 |  |  | $ | 90,496 |
Earnings per share: |  |  |  |  |  |  |  |
Basic |  | $ | 1.19 |  |  | $ | 1.46 |  |  | $ | 1.26 |  |  | $ | 1.05 |
Diluted |  | $ | 1.17 |  |  | $ | 1.43 |  |  | $ | 1.24 |  |  | $ | 1.04 |
﻿ |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |
Revenue |  | $ | 537,656 |  |  | $ | 580,752 |  |  | $ | 545,448 |  |  | $ | 549,386 |
Gross profit |  | $ | 303,099 |  |  | $ | 332,439 |  |  | $ | 305,643 |  |  | $ | 300,361 |
Operating income |  | $ | 113,044 |  |  | $ | 145,594 |  |  | $ | 117,350 |  |  | $ | 115,347 |
Net income attributable to IDEXX Laboratories, Inc. stockholders |  | $ | 89,451 |  |  | $ | 108,691 |  |  | $ | 93,251 |  |  | $ | 85,638 |
Earnings per share: |  |  |  |  |  |  |  |
Basic |  | $ | 1.02 |  |  | $ | 1.25 |  |  | $ | 1.07 |  |  | $ | 0.99 |
Diluted |  | $ | 1.01 |  |  | $ | 1.23 |  |  | $ | 1.05 |  |  | $ | 0.98 |
(1) Amounts presented may not recalculate to full-year totals due to rounding.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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