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Other Financial Statement Information (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Other Financial Statement Information (Textual) [Abstract]          
Cost of Inventories for certain materials using LIFO method $ 28.5   $ 28.5   $ 28.3
Charge to income before income taxes due to net increase in LIFO inventories $ 0.2 $ 0.6   $ 0.5  
Charge to income before income taxes     less than $.1 million