Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details Textual)

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Commitments and Contingencies (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies (Textual) [Abstract]      
Rental expense $ 3.2 $ 3.0 $ 3.5
Purchase commitments outstanding 49.3    
Recovery of Preferential payments $ 1.4