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Long-Term Debt (IKE Zone Act Senior Notes Due 2035) (Details) (IKE Zone 6 1/2% Tax-Exempt Revenue Bonds Due 2035 [Member], USD $)
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12 Months Ended | 1 Months Ended | ||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2011
Redeemed Prior To November 1, 2020 [Member]
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Dec. 31, 2011
Redeemed On Or After November 1, 2020 [Member]
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Dec. 31, 2010
Emergency Economic Stabilization Act Of 2008 [Member]
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Dec. 02, 2010
Emergency Economic Stabilization Act Of 2008 [Member]
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| Debt Instrument [Line Items] | ||||||
| Face amount | $ 65,000,000 | |||||
| Stated interest rate | 6.50% | 6.50% | 6.50% | |||
| Maturity date | Nov. 01, 2035 | |||||
| Percentage of principal required if called | 100.00% | 100.00% | ||||
| Minimum debt amount guaranteed by subsidiaries | 5,000,000 | |||||
| Amount drawn from bond proceeds | $ 17,299,000 | |||||