Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 678,622	$ 631,685
Accumulated depreciation	(278,400)	(238,265)
Property, plant and equipment, net	400,222	393,420
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46,386	44,864
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	117,505	110,988
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	372,988	336,856
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	90,651	91,015
Aircraft [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,650	11,650
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 39,442	$ 36,312

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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