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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Schedule Of Guarantees  
Maximum potential undiscounted payments $ 290,208
Performance guarantees through letters of credit
  
Schedule Of Guarantees  
Term 2013-2017
Maximum potential undiscounted payments 187,951
Standby letters of credit
  
Schedule Of Guarantees  
Term 2013-2014
Maximum potential undiscounted payments 13,399
Commercial letters of credit
  
Schedule Of Guarantees  
Term 2014
Maximum potential undiscounted payments 2,062
Bid bonds and performance bonds
  
Schedule Of Guarantees  
Term 2013-2021
Maximum potential undiscounted payments $ 86,796