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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

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-Name Accounting Standards Codification

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-Section S99

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-Name Regulation S-X (SX)

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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

-Name Accounting Standards Codification

-Topic 230

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-Section 45

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

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-Section 50

-Paragraph 1

-Subparagraph (b)

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

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Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 364,027us-gaap_PropertyPlantAndEquipmentGross	$ 356,029us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization	(241,849)	(232,615)
Property, plant and equipment, net	122,178us-gaap_PropertyPlantAndEquipmentNet	123,414us-gaap_PropertyPlantAndEquipmentNet
Depreciation and amortization	36,524us-gaap_Depreciation	36,310us-gaap_Depreciation	31,204us-gaap_Depreciation
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	120,528	116,376
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	45,036	49,296
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20,693	22,036
Computer hardware/software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	89,638	86,624
Land, buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	81,206	77,923
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,926	$ 3,774