Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 437,491	$ 415,527
Less accumulated depreciation	(186,700)	(164,818)
Property, Plant and Equipment, Net, Excluding Capital Leased Assets	250,791	250,709
Composite mats (rental fleet)	100,543	100,341
Less accumulated depreciation - composite mats	(47,680)	(43,418)
Property, Plant and Equipment, Gross	52,863	56,923
Property, plant and equipment, net	303,654	307,632
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	11,505	11,613
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	121,967	122,514
Machinery and heavy equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	248,229	224,974
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	30,544	29,688
Furniture, fixtures & trailers [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	5,829	5,788
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 19,417	$ 20,950