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SEGMENT REPORTING (Schedule of Segment Reporting Infomation by Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 234,636 | $ 199,574 | $ 175,628 |
Operating income | 56,535 | 47,998 | 40,644 |
Assets | 112,576 | 100,570 | 72,699 |
Goodwill | 3,777 | 3,406 | 3,356 | [1]
Expenditures for assets | 10,027 | 9,331 | 14,871 |
Depreciation and amortization | 10,358 | 9,160 | 8,788 |
Impairment of goodwill and intangible assets |  |  | 929 |
Location Based Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 169,752 | 141,940 | 127,683 |
Operating income | 55,012 | 44,045 | 37,268 |
Assets | 95,384 | 84,777 | 62,236 |
Goodwill | 1,732 | 1,562 | 1,539 | [1]
Expenditures for assets | 9,346 | 9,063 | 14,478 |
Depreciation and amortization | 10,030 | 8,980 | 8,636 |
Impairment of goodwill and intangible assets |  |  |  |
Wireless Communications Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 64,884 | 57,634 | 47,945 |
Operating income | 1,523 | 3,953 | 3,376 |
Assets | 17,192 | 15,793 | 10,463 |
Goodwill | 2,045 | 1,844 | 1,817 | [1]
Expenditures for assets | 681 | 268 | 393 |
Depreciation and amortization | $ 328 | $ 180 | 152 |
Impairment of goodwill and intangible assets |  |  | $ 929 |
[1] | The accumulated amount of goodwill impairment loss as of December 31, 2017, 2016 and 2015 was US$ 7,098,000.

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