Property and Equipment, Net - Property and Equipment Table (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 413,290	$ 398,060
Less: Accumulated depreciation	218,670	213,030
Property and equipment, net	194,620	185,030
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,360	6,410
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	60,120	59,610
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 346,810	$ 332,040

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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