v2.4.0.6
Other Liabilities (Details Textual) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Other Liabilities (Textual) [Abstract]    
Fair value of fuel and commodity hedges included in other accrued liabilities $ 1.8 $ 1.6
Fair value of self-insurance liability, discounting rate 9.75%  
Liabilities for unpaid and incurred but not reported claims $ 432.4