GOODWILL AND OTHER INTANGIBLE ASSETS, Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization expense		$ 6,700	$ 7,000	$ 7,000
Intangible assets, impairment charges	$ 4,300
Components of definite and indefinite-lived intangible assets [Abstract]
Gross Carrying Amount		98,521	96,823
Accumulated Amortization		29,155	21,995
Net Carrying Amount		69,366	74,828
Estimated amortization expense for intangible assets [Abstract]
2018		6,290
2019		6,288
2020		6,251
2021		6,281
2022		$ 4,685
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets amortization period		2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets amortization period		19 years
Patents, Licenses and Technology [Member]
Components of definite and indefinite-lived intangible assets [Abstract]
Gross Carrying Amount		$ 39,218	38,658
Accumulated Amortization		14,926	11,276
Net Carrying Amount		24,292	27,382
Customer Relationships [Member]
Components of definite and indefinite-lived intangible assets [Abstract]
Gross Carrying Amount		44,704	43,821
Accumulated Amortization		11,478	8,302
Net Carrying Amount		33,226	35,519
Non-compete Agreements [Member]
Components of definite and indefinite-lived intangible assets [Abstract]
Gross Carrying Amount		2,711	2,667
Accumulated Amortization		2,711	2,376
Net Carrying Amount		0	291
Trademarks [Member]
Components of definite and indefinite-lived intangible assets [Abstract]
Gross Carrying Amount		11,888	11,677
Accumulated Amortization		40	41
Net Carrying Amount		$ 11,848	$ 11,636