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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Schedule Of Guarantees  
Maximum potential undiscounted payments $ 285,294
Performance guarantees through letters of credit
  
Schedule Of Guarantees  
Term 2014-2017
Maximum potential undiscounted payments 200,369
Standby letters of credit
  
Schedule Of Guarantees  
Term 2014
Maximum potential undiscounted payments 11,401
Commercial letters of credit
  
Schedule Of Guarantees  
Term 2014
Maximum potential undiscounted payments 6,173
Bid bonds and performance bonds
  
Schedule Of Guarantees  
Term 2014-2023
Maximum potential undiscounted payments $ 67,351