INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intangible assets subject to amortization
Gross Amount	$ 50,043	$ 48,467
Accumulated amortization	(17,970)	(14,215)
Net Book Value	32,073	34,252
Amortization expense for intangible assets	3,219	3,204	$ 2,644
Estimated amortization expense
2018	3,268
2019	3,268
2020	3,268
2021	3,002
Thereafter	19,267
Net Book Value	32,073	34,252
Customer lists
Intangible assets subject to amortization
Gross Amount	38,659	37,868
Accumulated amortization	(12,721)	(10,087)
Net Book Value	25,938	27,781
Estimated amortization expense
Net Book Value	$ 25,938	27,781
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	$ 6,213	6,038
Accumulated amortization	(2,798)	(2,281)
Net Book Value	3,415	3,757
Estimated amortization expense
Net Book Value	$ 3,415	3,757
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	$ 5,147	4,537
Accumulated amortization	(2,443)	(1,840)
Net Book Value	2,704	2,697
Estimated amortization expense
Net Book Value	$ 2,704	2,697
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	(8)	(7)
Net Book Value	$ 16	17
Estimated Life	17 years
Estimated amortization expense
Net Book Value	$ 16	$ 17