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Business Combinations (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 13, 2012
Business Acquisition [Line Items]    
Purchase price financed with revolving credit facility   $ 31,800
Revolving credit facility face value 300,000  
Quebec Silicon Limited Partnership [Member]
   
Business Acquisition [Line Items]    
Percentage of interest acquired   51.00%
Revolving credit facility face value   300,000
Purchase price, cash paid   8,803
Percentage finished goods purchased (in hundredths)   51.00%
Goodwill recorded   $ 3,190
Dow Corning [Member] | Quebec Silicon Limited Partnership [Member]
   
Business Acquisition [Line Items]    
Right to purchase the plant output   49.00%