SEGMENT INFORMATION - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information
Revenue from contracts with customers	$ 303,443	$ 255,311
Operating (Loss) Income	(3,641)	(10,756)
North America
Segment Reporting Information
Revenue from contracts with customers	281,994	236,026
Operating (Loss) Income	742	(5,365)
Adjusted EBITDA	39,689	39,605
Europe
Segment Reporting Information
Revenue from contracts with customers	21,449	19,285
Operating (Loss) Income	(4,383)	(5,391)
Adjusted EBITDA	$ (2,510)	$ (2,965)

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.

No definition available.

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