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Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Fair value of financial instruments
Property, Plant and Equipment, Gross	$ 848,622	$ 788,529
Property, Plant, and Equipment, Fair Value Disclosure	20,100
Fair Value Inputs, Discount Rate	9.00%
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value of financial instruments
Property, Plant, and Equipment, Fair Value Disclosure	0
Significant Observable Inputs (Level 2)
Fair value of financial instruments
Property, Plant, and Equipment, Fair Value Disclosure	0
Significant Unobservable Inputs (Level 3)
Fair value of financial instruments
Property, Plant, and Equipment, Fair Value Disclosure	20,100
Machinery and equipment
Fair value of financial instruments
Property, Plant and Equipment, Gross	25,900
Property, Plant, and Equipment, Fair Value Disclosure	20,100
Asset Impairment Charges	$ 5,800

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- Definition

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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