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Debt (Details) (Line of Credit [Member], USD $)
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Sep. 30, 2014
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Aug. 12, 2014
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|---|---|---|
| Line of Credit Facility [Line Items] | ||
| Line of credit facility, available borrowing capacity | $ 248,600,000 | |
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Revolving Credit Facility [Member]
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| Line of Credit Facility [Line Items] | ||
| Line of credit facility, maximum principle amount | 250,000,000 | |
| Line of credit facility, additional borrowing capacity | 250,000,000 | |
| Line of credit facility, borrowings outstanding | 0 | |
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Standby Letters of Credit [Member]
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| Line of Credit Facility [Line Items] | ||
| Line of credit facility, maximum principle amount | 40,000,000 | |
| Line of credit facility, borrowings outstanding | 1,400,000 | |
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Swing Line Loan [Member]
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| Line of Credit Facility [Line Items] | ||
| Line of credit facility, maximum principle amount | $ 25,000,000 |