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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Schedule Of Guarantees  
Maximum potential undiscounted payments $ 322,474
Performance guarantees through letters of credit
 
Schedule Of Guarantees  
Term 2013-2017
Maximum potential undiscounted payments 227,393
Standby letters of credit
 
Schedule Of Guarantees  
Term 2013-2014
Maximum potential undiscounted payments 13,446
Commercial letters of credit
 
Schedule Of Guarantees  
Term 2013-2014
Maximum potential undiscounted payments 771
Bid bonds and performance bonds
 
Schedule Of Guarantees  
Term 2013-2018
Maximum potential undiscounted payments $ 80,864