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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
General Discussion of Pension and Other Postretirement Benefits [Abstract]      
Total expense under employee benefit plans $ 3.1 $ 2.3 $ 2.1
Company contributions 0.3 0.3 0.3
Liability under the defined benefit plans $ 4.0 $ 2.9