OVERVIEW AND BASIS OF PRESENTATION (NARRATIVE) (DETAILS) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
UNUSUAL OR INFREQUENT ITEM [Line Items]
Impairment losses	$ 5,602		$ 3,066				$ 5,602	$ 3,066
Tax Authorities Member
UNUSUAL OR INFREQUENT ITEM [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions					$ 1,100				$ 301	$ 358	$ 137	$ 123	$ 180
Sofica [Member]
UNUSUAL OR INFREQUENT ITEM [Line Items]
Other comprehensive income before reclassifications - foreign currency translation adjustment				$ 3,200	1,500					1,700
Philippines pension liability [Member]
UNUSUAL OR INFREQUENT ITEM [Line Items]
Other, net of tax					2,700
Government Authorities [Member]
UNUSUAL OR INFREQUENT ITEM [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions				$ 1,750	$ 234					$ 645	$ 406	$ 466
WebMetro
UNUSUAL OR INFREQUENT ITEM [Line Items]
Impairment losses		$ 2,900	$ 600			$ 2,300