OPERATING SEGMENTS -Disclosure of detailed information about revenues, geographic information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Disclosure of operating segments [Line items]
Revenue	$ 401,177	$ 376,245
Percentage of entity's revenue	100.00%	100.00%
United States
Disclosure of operating segments [Line items]
Revenue	$ 358,993	$ 331,625
Percentage of entity's revenue	90.00%	88.00%
Europe
Disclosure of operating segments [Line items]
Revenue	$ 21,832	$ 25,661
Percentage of entity's revenue	5.00%	7.00%
Other
Disclosure of operating segments [Line items]
Revenue	$ 20,352	$ 18,959
Percentage of entity's revenue	5.00%	5.00%

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details