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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Schedule Of Guarantees
Maximum potential undiscounted payments	$ 244,300us-gaap_GuaranteeObligationsMaximumExposure
Performance guarantees through letters of credit
Schedule Of Guarantees
Term	2015-2019
Maximum potential undiscounted payments	149,362us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_PerformanceGuaranteeMember
Standby letters of credit
Schedule Of Guarantees
Term	2015
Maximum potential undiscounted payments	12,910us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_StandbyLettersOfCreditMember
Commercial letters of credit
Schedule Of Guarantees
Term	2015
Maximum potential undiscounted payments	3,426us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_LetterOfCreditMember
Bid bonds and performance bonds
Schedule Of Guarantees
Term	2015-2023
Maximum potential undiscounted payments	$ 78,602us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_SuretyBondMember

X

- 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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X

- 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

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- Details

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- Details

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