Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of Property and Equipment
Property and equipment, gross	$ 250,119	$ 239,754
Less accumulated depreciation and amortization	(97,574)	(86,908)
Property and equipment, net	152,545	152,846
Land and improvements [Member]
Summary of Property and Equipment
Property and equipment, gross	23,651	20,101
Building [Member]
Summary of Property and Equipment
Property and equipment, gross	39,834	41,319
Machinery and equipment [Member]
Summary of Property and Equipment
Property and equipment, gross	155,276	147,814
Equipment under capital lease [Member]
Summary of Property and Equipment
Property and equipment, gross	21,452	21,310
Construction in progress [Member]
Summary of Property and Equipment
Property and equipment, gross	$ 9,906	$ 9,210

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 of long-lived 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, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

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