Annual report pursuant to Section 13 and 15(d)

Inventories (Details Textual)

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Inventories (Details Textual) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Inventories (Textual) [Abstract]    
Reserve for inventory valuation $ 12.0 $ 10.6
Percentage of Reserve for inventory valuation 19.80% 20.90%