SEGMENT INFORMATION (Details) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment information
Number of operating segments \| segment	1
Identifiable assets	$ 470,785	$ 349,197
Revenues derived from foreign subsidiaries	$ 403,516	$ 366,694	$ 371,084
Total Revenue \| Customer Concentration Risk \| Customer One
Segment information
Percentage of concentration risk	15.00%	15.00%	16.00%
Trade receivables \| Customer Concentration Risk \| Customer One
Segment information
Percentage of concentration risk	10.00%	22.00%
Outside the United States
Segment information
Identifiable assets	$ 32,807	$ 34,855
Revenues derived from foreign subsidiaries	185,288	171,847	$ 159,365
Wholly owned foreign subsidiaries
Segment information
Revenues derived from foreign subsidiaries	$ 163,988	$ 152,491	$ 126,737

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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