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Other Financial Statement Information (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Financial Statement Information (Textual) [Abstract]      
Cost of Inventories for certain materials using LIFO method $ 30.2 $ 28.3  
Depreciation of property and equipment 10.0 9.3 8.0
Capital leases of machinery and equipment $ 0.4 $ 0.5