INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jan. 12, 2016	Dec. 31, 2015
Intangible assets subject to amortization
Gross Amount	$ 49,211		$ 49,211			$ 41,137
Accumulated amortization	(13,642)		(13,642)			(11,153)
Total estimated amortization expense	35,569		35,569			29,984
Amortization expense for intangible assets	802	$ 661	2,409	$ 1,983
Estimated amortization expense
Remainder of 2016	803		803
2017	3,212		3,212
2018	3,212		3,212
2019	3,212		3,212
2020	3,212		3,212
2021	2,963		2,963
Thereafter	18,955		18,955
Total estimated amortization expense	35,569		35,569			29,984
Heidrive
Intangible assets subject to amortization
Intangible assets acquired from the acquisition					$ 7,710
Customer lists
Intangible assets subject to amortization
Gross Amount	38,241		38,241			34,149
Accumulated amortization	(9,605)		(9,605)			(7,785)
Total estimated amortization expense	28,636		28,636			26,364
Estimated amortization expense
Total estimated amortization expense	28,636		$ 28,636			26,364
Customer lists | Minimum
Intangible assets subject to amortization
Estimated Life			8 years
Customer lists | Maximum
Intangible assets subject to amortization
Estimated Life			15 years
Trade name
Intangible assets subject to amortization
Gross Amount	6,121		$ 6,121			4,775
Accumulated amortization	(2,163)		(2,163)			(1,793)
Total estimated amortization expense	3,958		3,958			2,982
Estimated amortization expense
Total estimated amortization expense	3,958		$ 3,958			2,982
Trade name | Minimum
Intangible assets subject to amortization
Estimated Life			10 years
Trade name | Maximum
Intangible assets subject to amortization
Estimated Life			17 years
Design and technologies
Intangible assets subject to amortization
Gross Amount	4,825		$ 4,825			2,189
Accumulated amortization	(1,867)		(1,867)			(1,570)
Total estimated amortization expense	2,958		2,958			619
Estimated amortization expense
Total estimated amortization expense	2,958		$ 2,958			619
Design and technologies | Minimum
Intangible assets subject to amortization
Estimated Life			8 years
Design and technologies | Maximum
Intangible assets subject to amortization
Estimated Life			15 years
Patents
Intangible assets subject to amortization
Gross Amount	24		$ 24			24
Accumulated amortization	(7)		(7)			(5)
Total estimated amortization expense	17		17			19
Estimated amortization expense
Total estimated amortization expense	$ 17		$ 17			$ 19