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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Schedule Of Guarantees  
Maximum potential undiscounted payments $ 337,170
Performance guarantees through letters of credit
  
Schedule Of Guarantees  
Term 2014-2017
Maximum potential undiscounted payments 203,131
Standby letters of credit
  
Schedule Of Guarantees  
Term 2014-2015
Maximum potential undiscounted payments 11,407
Commercial letters of credit
  
Schedule Of Guarantees  
Term 2014
Maximum potential undiscounted payments 527
Bid bonds and performance bonds
  
Schedule Of Guarantees  
Term 2014-2023
Maximum potential undiscounted payments $ 122,105