RESTRUCTURING CHARGES - Restructuring Reserve (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) job_position	Dec. 31, 2013 USD ($)
Restructuring Reserve [Roll Forward]
Balance Beginning of Year	$ 11,800,000
(Income) Expense, Net	1,300,000
Foreign Currency Translation	100,000
Cash utilized, net	(1,700,000)
Non-cash utilized, net	0
Balance End of Year	11,500,000	$ 11,800,000
Efficiency Program [Member]
Restructuring Reserve [Roll Forward]
Cash utilized, net	(600,000)	(2,800,000)
Efficiency Program [Member] | Employee Severance and Other Personnel Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance Beginning of Year	6,600,000
(Income) Expense, Net	1,000,000
Foreign Currency Translation	0
Cash utilized, net	(600,000)
Non-cash utilized, net	0
Balance End of Year	7,000,000	6,600,000
Efficiency Program [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Balance Beginning of Year	100,000
(Income) Expense, Net	300,000
Foreign Currency Translation	0
Cash utilized, net	0
Non-cash utilized, net	0
Balance End of Year	400,000	100,000
Integration Program [Member]
Restructuring Reserve [Roll Forward]
Cash utilized, net		(6,700,000)	$ (9,600,000)
Integration Program [Member] | Employee Severance and Other Personnel Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance Beginning of Year	800,000
(Income) Expense, Net	(100,000)
Foreign Currency Translation	100,000
Cash utilized, net	(600,000)
Non-cash utilized, net	0
Balance End of Year	200,000	800,000
Integration Program [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Balance Beginning of Year	100,000
(Income) Expense, Net	0
Foreign Currency Translation	0
Cash utilized, net	0
Non-cash utilized, net	0
Balance End of Year	100,000	100,000
December 2013 Program [Member]
Restructuring Reserve [Roll Forward]
Cash utilized, net		0	$ (15,500,000)	$ (100,000)
Number of positions eliminated | job_position			1,100
December 2013 Program [Member] | Employee Severance and Other Personnel Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance Beginning of Year	1,200,000
(Income) Expense, Net	0
Foreign Currency Translation	0
Cash utilized, net	0
Non-cash utilized, net	0
Balance End of Year	1,200,000	1,200,000
December 2013 Program [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Balance Beginning of Year	0
(Income) Expense, Net	0
Foreign Currency Translation	0
Cash utilized, net	0
Non-cash utilized, net	0
Balance End of Year	0	0
Other Immaterial Actions [Member] | Employee Severance and Other Personnel Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance Beginning of Year	2,300,000
(Income) Expense, Net	100,000
Foreign Currency Translation	0
Cash utilized, net	(500,000)
Non-cash utilized, net	0
Balance End of Year	1,900,000	2,300,000
Other Immaterial Actions [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Balance Beginning of Year	700,000
(Income) Expense, Net	0
Foreign Currency Translation	0
Cash utilized, net	0
Non-cash utilized, net	0
Balance End of Year	$ 700,000	$ 700,000