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Property, Plant and Equipment (Details Textual) (USD $)	12 Months Ended
Property, Plant and Equipment (Details Textual) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Depreciation	$ 27,289,000	$ 26,995,000

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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