REPORTABLE SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information, Profit (Loss) [Abstract]
Total revenue	$ 160,434	$ 156,881
Operating income	(849)	2,969
Depreciation	14,873	15,344
Amortization of intangible assets	1,442	1,529
Income (loss) before income tax	(10,516)	(2,289)
Total assets	601,050	620,070	$ 570,235
Corporate/Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Total revenue	(1,543)	(782)
Operating income	(5,735)	(5,803)
Depreciation	39	40
Income (loss) before income tax	(11,712)	(8,349)
Total assets	37,584	10,585
Flatbed
Segment Reporting Information, Profit (Loss) [Abstract]
Intersegment revenues and expenses		300
Total revenue	81,304	76,089
Operating income	3,879	4,890
Depreciation	7,083	7,130
Amortization of intangible assets	437	489
Income (loss) before income tax	2,105	3,608
Total assets	281,800	301,129
Flatbed | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Intersegment revenues and expenses	900	900
Specialized
Segment Reporting Information, Profit (Loss) [Abstract]
Total revenue	80,673	81,574
Operating income	1,007	3,882
Depreciation	7,751	8,174
Amortization of intangible assets	1,005	1,040
Income (loss) before income tax	(909)	2,452
Total assets	281,666	308,356
Specialized | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Intersegment revenues and expenses	$ 600	$ 500