OTHER INTANGIBLE ASSETS (NARRATIVE) (DETAILS) - USD ($) $ in Thousands	3 Months Ended									6 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted Average Useful Life [Line Items]
Amortization expense related to intangible assets											$ 9,700	$ 9,600	$ 7,200
Impairment losses	$ 5,034	$ 3,066	$ 0	$ 0	$ 373	$ 0	$ 0	$ 0			$ 8,100	$ 373	$ 1,205
Customer Strategy Services [Member]
Weighted Average Useful Life [Line Items]
Estimated royalty rate									6.00%
Growth rate									7.00%
Indefinite-Lived Trade Names									$ 5,300	$ 5,300
Impairment losses									$ 1,100
Customer Relationships [Member]
Weighted Average Useful Life [Line Items]
Weighted average useful life of intangible assets											4 years 8 months 12 days
Trade Names [Member] | Customer Strategy Services [Member]
Weighted Average Useful Life [Line Items]
Discount rate										38.00%
Other Intangible Assets [Member]
Weighted Average Useful Life [Line Items]
Weighted average useful life of intangible assets											2 years 4 months 24 days