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SEGMENT INFORMATION - Financial Data by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 1,246,874 | $ 1,104,592 | $ 3,539,375 | $ 3,158,789
Operating income (loss) | 185,852 | 172,832 | 420,035 | 431,219
Operating segments | Match Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 541,493 | 443,943 | 1,504,091 | 1,272,506
Operating income (loss) | 176,604 | 139,895 | 468,330 | 402,293
Adjusted EBITDA | 206,131 | 165,039 | 564,720 | 478,341
Operating segments | ANGI Homeservices |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 357,358 | 303,116 | 1,004,697 | 853,249
Operating income (loss) | 24,726 | 33,515 | 32,488 | 46,021
Adjusted EBITDA | 58,923 | 77,700 | 147,534 | 181,319
Operating segments | Vimeo |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 52,145 | 40,304 | 141,439 | 115,432
Operating income (loss) | (11,155) | (6,161) | (40,555) | (25,502)
Adjusted EBITDA | (7,997) | (4,229) | (33,661) | (19,644)
Operating segments | Dotdash |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 40,285 | 30,053 | 111,974 | 90,841
Operating income (loss) | 3,695 | 2,416 | 13,752 | 6,946
Adjusted EBITDA | 7,026 | 3,071 | 22,551 | 8,914
Operating segments | Applications |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 126,071 | 153,973 | 402,557 | 429,034
Operating income (loss) | 39,099 | 33,041 | 85,422 | 91,579
Adjusted EBITDA | 25,433 | 34,989 | 80,440 | 97,145
Operating segments | Emerging & Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 129,581 | 133,345 | 374,871 | 398,026
Operating income (loss) | (1,821) | 10,893 | (6,130) | 23,465
Adjusted EBITDA | (1,529) | 12,235 | (5,141) | 28,733
Inter-segment eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | (59) | (142) | (254) | (299)
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (45,296) | (40,767) | (133,272) | (113,583)
Adjusted EBITDA | $ (21,945) | $ (21,478) | $ (60,751) | $ (54,038)

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- Definition The Company's primary financial measure is Adjusted EBITDA, which is defined as operating income excluding: (1) stock-based compensation expense; (2) depreciation; and (3) acquisition-related items consisting of (i) amortization of intangible assets and impairments of goodwill and intangible assets, if applicable, and (ii) gains and losses recognized on changes in the fair value of contingent consideration arrangements. The Company believes this measure is useful for analysts and investors as this measure allows a more meaningful comparison between our performance and that of our competitors. Moreover, our management uses this measure internally to evaluate the performance of our business as a whole and our individual business segments, and this measure is one of the primary metrics by which our internal budgets are based and by which management is compensated. The above items are excluded from our Adjusted EBITDA measure because these items are non-cash in nature, and we believe that by excluding these items, Adjusted EBITDA corresponds more closely to the cash operating income generated from our business, from which capital investments are made and debt is serviced. Adjusted EBITDA has certain limitations in that it does not take into account the impact to IAC's statement of operations of certain expenses. + References No definition available. + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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