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OVERVIEW AND BASIS OF PRESENTATION (NARRATIVE) (DETAILS) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions | $ 300 | $ (200) | $ 700 | $ (300) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses | $ 5,322 | $ 0 | $ 0 | $ 0 | $ 26,448 | $ 5,602 | $ 0 | $ 0 |  |  |  |  |  | $ 5,322 | $ 32,050 | $ 8,100 |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 105 | $ 721 | (2,707) |  |  |  |
Tax Authorities Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  |  |  |  |  |  |  | $ 1,100 |  |  |  |  |  |  |  | 301 | $ 358 | $ 137 | $ 123 | $ 180
Government Authorities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  |  |  |  |  |  |  |  |  |  | $ 1,750 |  |  |  |  | $ 234 | 645 | $ 406 | $ 466 |
Sofica [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income before reclassifications - foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  | $ 3,200 | $ 1,500 |  |  |  |  | $ 1,700 |  |  |
Philippines pension liability [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | $ 2,700 |  |  |  |  |  |  |  |
WebMetro |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  | $ 2,900 | $ 600 |  |  | $ 2,300 |  |  |  |  |  |  |

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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