SEGMENT INFORMATION - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information
Revenue from contracts with customers	$ 294,822	$ 180,711	$ 550,133	$ 331,456
Operating (Loss) Income	23,262	(2,836)	12,506	(1,448)
North America
Segment Reporting Information
Revenue from contracts with customers	277,505	165,491	513,531	303,563
Operating (Loss) Income	26,110	1,784	20,745	8,208
Adjusted EBITDA	68,088	17,112	107,693	31,296
Europe
Segment Reporting Information
Revenue from contracts with customers	17,317	15,220	36,602	27,893
Operating (Loss) Income	(2,848)	(4,620)	(8,239)	(9,656)
Adjusted EBITDA	$ (1,109)	$ (2,141)	$ (4,074)	$ (6,113)

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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