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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Property, Plant, and Equipment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Property, plant and equipment
Property, plant and equipment, gross	$ 382,525		$ 382,525		$ 382,915
Less accumulated depreciation	271,112		271,112		267,112
Property, plant, and equipment, net	111,413		111,413		115,803
Depreciation expense	4,092	4,269	7,961	9,143
Land
Property, plant and equipment
Property, plant and equipment, gross	9,682		9,682		8,861
Buildings and improvements
Property, plant and equipment
Property, plant and equipment, gross	179,498		179,498		179,999
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, gross	$ 193,345		$ 193,345		$ 194,055