RESTRUCTURING CHARGES - Summary of the Activity Related to the Accrual for Restructuring Charges Detailed by Event (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	$ 14,791	$ 19,319	$ 19,725		$ 19,725
(Credits) charges – Employee termination costs, net of change in estimate	(584)	4,882	1,147	$ 840	5,445	$ (967)
Non-cash - Other	1,004	(217)	(181)
Payments – Employee termination costs	(4,399)	(7,851)	(1,274)
Foreign exchange gain	54	(1,342)	98
Balance at end of period	10,758	14,791	19,319		10,758
Quarter Two 2010
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	281	281	281		281
(Credits) charges – Employee termination costs, net of change in estimate	0	0	0
Non-cash - Other	0	0	0
Payments – Employee termination costs	0	0	0
Foreign exchange gain	0	0	0
Balance at end of period	281	281	281		281
Quarter Two 2012
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	38	19	19		19
(Credits) charges – Employee termination costs, net of change in estimate	0	(210)	0
Non-cash - Other	0	0	0
Payments – Employee termination costs	0	229	0
Foreign exchange gain	0	0	0
Balance at end of period	38	38	19		38
Quarter One 2013
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	3,306	3,384	3,988		3,988
(Credits) charges – Employee termination costs, net of change in estimate	0	(153)	(49)
Non-cash - Other	0	0	0
Payments – Employee termination costs	(582)	(196)	(524)
Foreign exchange gain	(32)	271	31
Balance at end of period	2,756	3,306	3,384		2,756
Quarter Three 2013
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	0	9	9		9
(Credits) charges – Employee termination costs, net of change in estimate	0	(9)	0
Non-cash - Other		0	0
Payments – Employee termination costs	0	0	0
Foreign exchange gain	0	0	0
Balance at end of period	0	0	9		0
Quarter Three 2014
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	1,008	634	920		920
(Credits) charges – Employee termination costs, net of change in estimate	(166)	1,651	488
Non-cash - Other	840	(213)	(175)
Payments – Employee termination costs	(1,646)	(1,064)	(540)
Foreign exchange gain	0	0	59
Balance at end of period	36	1,008	634		36
Quarter Four 2014
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	9,485	14,493	14,508		14,508
(Credits) charges – Employee termination costs, net of change in estimate	(432)	899	6
Non-cash - Other	(10)	(4)	(6)
Payments – Employee termination costs	(1,543)	(4,287)	(14)
Foreign exchange gain	86	(1,616)	1
Balance at end of period	7,414	9,485	14,493		7,414
Quarter One 2015
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	0	499	0		0
(Credits) charges – Employee termination costs, net of change in estimate	0	2,006	702
Non-cash - Other	0	0	0
Payments – Employee termination costs	0	(2,508)	(196)
Foreign exchange gain	0	3	7
Balance at end of period	0	0	499		0
Quarter Two 2015
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	673	0	0		0
(Credits) charges – Employee termination costs, net of change in estimate	14	698	0
Non-cash - Other	174	0	0
Payments – Employee termination costs	(628)	(25)	0
Foreign exchange gain	0	0	0
Balance at end of period	$ 233	$ 673	$ 0		$ 233