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SEGMENT REPORTING (Schedule of Segment Reporting Infomation by Segment) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Revenues $ 120,794 $ 113,447  
Operating income 30,331 27,969  
Assets 95,030   $ 112,576
Goodwill 3,587   3,777
Expenditures for assets 7,084 3,096  
Depreciation and amortization 4,735 4,980  
Location Based Services [Member]      
Segment Reporting Information [Line Items]      
Revenues 87,189 81,437  
Operating income 29,433 25,487  
Assets 77,364   95,384
Goodwill 1,645   1,732
Expenditures for assets 6,802 2,846  
Depreciation and amortization 4,517 4,847  
Wireless Communications Products [Member]      
Segment Reporting Information [Line Items]      
Revenues 33,605 32,010  
Operating income 898 2,482  
Assets 17,666   17,192
Goodwill 1,942   $ 2,045
Expenditures for assets 282 250  
Depreciation and amortization $ 218 $ 133