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Commitments and Contingencies Available Lines of Credit, Outstanding Standby Letter of Credits, and Bonds (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2014
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Dec. 31, 2013
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| Line of Credit Facility [Line Items] | ||||||||
| Multicurrency revolving line of credit | $ 660,000 | |||||||
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Credit Facility [Member]
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| Line of Credit Facility [Line Items] | ||||||||
| Multicurrency revolving line of credit | 660,000 | [1] | 660,000 | [1] | ||||
| Long-term borrowings | 70,000 | (120,000) | [1] | |||||
| Standby LOCs issued and outstanding | 49,054 | (49,491) | [1] | |||||
| Net available for additional borrowings and LOCs | 540,946 | [1] | 490,509 | [1] | ||||
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Unsecured Multicurrency Revolving Lines of Credit [Member]
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| Line of Credit Facility [Line Items] | ||||||||
| Multicurrency revolving line of credit | 103,617 | 115,269 | ||||||
| Standby LOCs issued and outstanding | (27,979) | (31,714) | ||||||
| Short-term borrowings(2) | (7,138) | [2] | (4,252) | [2] | ||||
| Net available for additional borrowings and LOCs | 68,500 | 79,303 | ||||||
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Surety Bond [Member]
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| Line of Credit Facility [Line Items] | ||||||||
| Unsecured surety bonds in force | $ 140,550 | $ 186,446 | ||||||
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