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SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment information
Number of operating segments | segment	1
Identifiable assets	$ 312,017		$ 285,301
Total Revenue
Segment information
Percentage of concentration risk	16.00%	21.00%
Trade receivables
Segment information
Percentage of concentration risk	20.00%		13.00%
Outside the United States
Segment information
Revenues derived from foreign subsidiaries	$ 43,680	$ 36,302
Wholly owned foreign subsidiaries
Segment information
Revenues derived from foreign subsidiaries	34,579	$ 32,405
Identifiable assets	$ 91,478		$ 88,400

X

- Definition

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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