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Other Contingencies (Details) (USD $)
6 Months Ended
Jun. 30, 2011
Jul. 01, 2011
Bank line of credit $ 42,000,000 $ 57,000,000
Line of credit expiration date June 30, 2012  
Number of states in which the entity operates 47  
Standby Letter Of Credit [Member]
   
Irrevocable standby letter of credit, outstanding $ 40,420,000