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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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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

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Describe the approximate term of the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_GuaranteesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration