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SEGMENT REPORTING (Schedule of Segment Reporting Infomation by Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | $ 175,628 | $ 182,127 | $ 170,167 |
Operating income (loss) |  | 40,644 | 45,870 | 37,930 |
Assets |  | 72,699 | 74,889 | 76,864 |
Goodwill |  | 3,356 | 4,041 | 5,433 | [1]
Expenditures for assets |  | 14,871 | 13,172 | 12,576 |
Depreciation and amortization |  | 8,788 | 9,068 | 9,718 |
Impairment of goodwill and intangible assets | [2] | 929 | 922 | 4,620 |
Location Based Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | 127,683 | 133,692 | 126,951 |
Operating income (loss) |  | 38,328 | 42,603 | 38,470 |
Assets |  | 62,236 | 63,795 | 66,300 |
Goodwill |  | 1,539 | 1,544 | 1,730 | [1]
Expenditures for assets |  | 14,478 | 12,574 | 12,312 |
Depreciation and amortization |  | $ 8,636 | 8,920 | 9,360 |
Impairment of goodwill and intangible assets |  |  | 34 | 2,816 |
Wireless Communications Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  | $ 47,945 | 48,435 | 43,216 |
Operating income (loss) |  | 2,316 | 3,267 | (540) |
Assets |  | 10,463 | 11,094 | 10,564 |
Goodwill |  | 1,817 | 2,497 | 3,703 | [1]
Expenditures for assets |  | 393 | 598 | 264 |
Depreciation and amortization |  | 152 | 148 | 358 |
Impairment of goodwill and intangible assets |  | $ 929 | $ 888 | $ 1,804 |
[1] | The accumulated amount of impairment loss as of December 31, 2013, December 31, 2014 and December 31, 2015 was US$ 5,545,000, US$ 6,424,000 and US$ 7,098,000, respectively.
[2] | See Notes 7, 8 and 1N.

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