OVERVIEW AND BASIS OF PRESENTATION (NARRATIVE) (DETAILS) - USD ($) $ in Thousands	3 Months Ended													12 Months Ended
	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