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Commitment and Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2013 $ 12,620,000    
2014 10,040,000    
2015 5,454,000    
2016 3,173,000    
2017 2,034,000    
Thereafter 540,000    
Total minimum lease payments 33,861,000    
Operating leases, rent expense 302,000,000 745,000,000 754,000,000
Purchase Commitment [Member]
      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Unconditional purchase order obligations $ 21,200,000