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SEGMENT INFORMATION - Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue and Long-lived Assets by Geography
Revenue	$ 303,443	$ 255,311
Long-lived assets (excluding goodwill and intangible assets)	79,618		$ 70,859
United States
Revenue and Long-lived Assets by Geography
Revenue	278,478	233,475
Long-lived assets (excluding goodwill and intangible assets)	73,949		65,510
All other countries
Revenue and Long-lived Assets by Geography
Revenue	24,965	$ 21,836
Long-lived assets (excluding goodwill and intangible assets)	$ 5,669		$ 5,349

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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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.

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