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Schedule of Available Capacity Under Commercial Paper Program (Details) (Commercial Paper Program, USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
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Commercial Paper Program
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| Short Term Debt [Line Items] | ||
| Commercial paper program | $ 1,000,000 | $ 700,000 |
| Commercial paper program available capacity | $ 369,500 | $ 430,000 |