Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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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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SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
SEGMENT INFORMATION (Details) $ in Thousands	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment information
Number of operating segments \| segment			1
Revenues derived from foreign subsidiaries	$ 103,509	$ 94,653	$ 306,723	$ 273,696
Identifiable assets	$ 363,610		$ 363,610		$ 349,197
Total Revenue \| Customer Concentration Risk \| Customer One
Segment information
Percentage of concentration risk	16.00%	20.00%	16.00%	15.00%
Trade receivables \| Customer Concentration Risk \| Customer
Segment information
Percentage of concentration risk			16.00%		22.00%
Outside the United States
Segment information
Revenues derived from foreign subsidiaries	$ 45,350	$ 41,411	$ 140,565	$ 128,170
Identifiable assets	32,452		32,452		$ 34,855
Wholly owned foreign subsidiaries
Segment information
Revenues derived from foreign subsidiaries	$ 39,183	$ 38,468	$ 124,050	$ 113,834