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Property, Plant and Equipment (Details Textual) (USD $)	3 Months Ended		9 Months Ended
Property, Plant and Equipment (Details Textual) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Depreciation	$ 6,806,000	$ 6,736,000	$ 20,408,000	$ 20,232,000

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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