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Accounting Policies Self-Insurance Reserves (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Self-Insurance Reserves [Abstract]  
Self Insurance Medical Claims Coverage Ceiling per employee $ 0.2
Self insurance Workers' Comp Coverage Ceiling per accident 1.0
Self Insurance General Liability Claims Coverage Ceiling per occurence 4.0
Self Insurance Auto Liabiity Coverage Ceiling per accident $ 4.0