OTHER INTANGIBLE ASSETS (NARRATIVE) (DETAILS) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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, 2016	Dec. 31, 2015	Dec. 31, 2014
Weighted Average Useful Life [Line Items]
Impairment losses	$ 26,448	$ 5,602	$ 0	$ 0	$ 5,034	$ 3,066	$ 0	$ 0	$ 32,050	$ 8,100	$ 373
CTS - Avaya
Weighted Average Useful Life [Line Items]
Impairment of Intangible Assets, Finite-lived	900	400
Impairment losses	11,300	$ 700
CSS - component held-for-sale
Weighted Average Useful Life [Line Items]
Amortization expense related to intangible assets									$ 9,500	$ 9,700	$ 9,600
Customer Relationships [Member] | CTS - Avaya
Weighted Average Useful Life [Line Items]
Impairment losses	9,200
Customer Relationships [Member] | CSS - component held-for-sale
Weighted Average Useful Life [Line Items]
Weighted average useful life of intangible assets									5 years 7 months 6 days
Trade Names [Member] | CTS - Avaya
Weighted Average Useful Life [Line Items]
Impairment losses	400
Trade Names [Member] | CSS - rogenSi
Weighted Average Useful Life [Line Items]
Estimated royalty rate		2.00%
Growth rate		3.00%
Discount rate		18.20%
Impairment of Intangible Assets, Finite-lived	0	$ 3,100
Impairment losses	3,000	$ 1,200
Trade Names [Member] | CSS - component held-for-sale
Weighted Average Useful Life [Line Items]
Estimated royalty rate		3.75%
Growth rate		3.00%
Discount rate		19.20%
Impairment of Intangible Assets, Finite-lived		$ 2,000
Impairment losses		$ 3,300
Trade Names [Member] | Technology Solutions Group | CTS - Avaya
Weighted Average Useful Life [Line Items]
Estimated royalty rate		0.50%
Growth rate		3.00%
Discount rate		19.00%
Other Intangible Assets [Member] | CSS - component held-for-sale
Weighted Average Useful Life [Line Items]
Weighted average useful life of intangible assets									1 year 8 months 12 days
Non-compete intangible assets [Member] | CTS - Avaya
Weighted Average Useful Life [Line Items]
Impairment losses	400
Fixed Assets [Member] | CTS - Avaya
Weighted Average Useful Life [Line Items]
Impairment losses	$ 1,300