INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 12, 2016
Intangible assets subject to amortization
Gross Amount	$ 48,467	$ 41,137
Accumulated amortization	(14,215)	(11,153)
Net Book Value	34,252	29,984
Amortization expense for intangible assets	3,204	2,644	$ 2,714
Estimated amortization expense
2017	3,162
2018	3,162
2019	3,162
2020	3,162
2021	2,929
Thereafter	18,675
Net Book Value	$ 34,252	29,984
Heidrive
Intangible assets subject to amortization
Estimated Life	14 years 6 months
Intangible assets acquired from the acquisition	$ 7,710			$ 7,710
Customer lists
Intangible assets subject to amortization
Gross Amount	37,868	34,149
Accumulated amortization	(10,087)	(7,785)
Net Book Value	27,781	26,364
Estimated amortization expense
Net Book Value	$ 27,781	26,364
Customer lists | Minimum
Intangible assets subject to amortization
Estimated Life	8 years
Customer lists | Maximum
Intangible assets subject to amortization
Estimated Life	17 years
Trade name
Intangible assets subject to amortization
Gross Amount	$ 6,038	4,775
Accumulated amortization	(2,281)	(1,793)
Net Book Value	3,757	2,982
Estimated amortization expense
Net Book Value	$ 3,757	2,982
Trade name | Minimum
Intangible assets subject to amortization
Estimated Life	10 years
Trade name | Maximum
Intangible assets subject to amortization
Estimated Life	12 years
Design and technologies
Intangible assets subject to amortization
Gross Amount	$ 4,537	2,189
Accumulated amortization	(1,840)	(1,570)
Net Book Value	2,697	619
Estimated amortization expense
Net Book Value	$ 2,697	619
Design and technologies | Minimum
Intangible assets subject to amortization
Estimated Life	10 years
Design and technologies | Maximum
Intangible assets subject to amortization
Estimated Life	12 years
Patents
Intangible assets subject to amortization
Gross Amount	$ 24	24
Accumulated amortization	(7)	(5)
Net Book Value	$ 17	19
Estimated Life	17 years
Estimated amortization expense
Net Book Value	$ 17	$ 19