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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 394,308	$ 386,172
Accumulated depreciation and amortization	(266,357)	(264,154)
Property, plant and equipment, net	127,951	122,018
Depreciation and amortization	38,881	36,294	$ 36,524
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	133,455	123,211
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	54,165	51,673
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,513	20,730
Computer hardware/software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	87,416	95,993
Land, buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	90,215	88,877
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7,544	$ 5,688

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Section S99
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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+ References

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