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Line of Credit (Narrative) (Details) (USD $)
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6 Months Ended |
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May 31, 2014
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Revolving Credit Facility [Member]
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| Line of Credit Facility [Line Items] | |
| Unsecured credit facility | $ 150,000,000.0 |
| Additional borrowing capacity | 75,000,000.0 |
| Line of credit facility outstanding amount | 0 |
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Standby letters of credit [Member]
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| Line of Credit Facility [Line Items] | |
| Additional borrowing capacity | 25,000,000.0 |
| Letters of credit outstanding amount | 800,000 |
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Swing line loans [Member]
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| Line of Credit Facility [Line Items] | |
| Additional borrowing capacity | $ 20,000,000.0 |