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SEGMENT REPORTING (Schedule of Segment Reporting Infomation by Segment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 13, 2018
Segment Reporting Information [Line Items]        
Revenues $ 253,335 $ 234,636 $ 199,574  
Operating income 62,378 56,535 47,998  
Assets 137,660 112,576 100,570  
Goodwill 62,896 3,777 3,406 [1] $ 59,402
Expenditures for assets 16,214 10,027 9,331  
Depreciation and amortization 9,116 10,358 9,160  
Telematics Services [Member]        
Segment Reporting Information [Line Items]        
Revenues 181,357 169,752 141,940  
Operating income 56,913 55,012 44,045  
Assets 101,305 95,384 84,777  
Goodwill 55,069 1,732 1,562  
Expenditures for assets 15,677 9,346 9,063  
Depreciation and amortization 8,630 10,030 8,980  
Telematics Products [Member]        
Segment Reporting Information [Line Items]        
Revenues 71,978 64,884 57,634  
Operating income 5,465 1,523 3,953  
Assets 36,355 17,192 15,793  
Goodwill 7,827 2,045 1,844  
Expenditures for assets 537 681 268  
Depreciation and amortization $ 486 $ 328 $ 180  
[1] The accumulated amount of goodwill impairment loss as of December 31, 2018, 2017 and 2016 was US$ 7,098,000.