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Financial Instruments and Risk Concentration (Details)
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Dec. 31, 2013
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Sep. 30, 2013
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2.35% senior notes due September 2016
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| Financial Instruments and Risk Concentration | ||
| Interest rate on senior notes due (as a percent) | 2.35% | 2.35% |
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5.10% senior notes due September 2023
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| Financial Instruments and Risk Concentration | ||
| Interest rate on senior notes due (as a percent) | 5.10% | 5.10% |
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6.15% senior notes due February 2018
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| Financial Instruments and Risk Concentration | ||
| Interest rate on senior notes due (as a percent) | 6.15% | |
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9.25% senior notes due January 2019
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| Financial Instruments and Risk Concentration | ||
| Interest rate on senior notes due (as a percent) | 9.25% | |
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5.00% senior notes due September 2020
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| Financial Instruments and Risk Concentration | ||
| Interest rate on senior notes due (as a percent) | 5.00% | |
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4.625% senior notes due September 2021
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| Financial Instruments and Risk Concentration | ||
| Interest rate on senior notes due (as a percent) | 4.625% |