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Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Jan. 31, 2006
6 5/8% Senior Notes Due 2016 [Member]
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Dec. 31, 2011
6 5/8% Senior Notes Due 2016 [Member]
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Dec. 31, 2010
6 5/8% Senior Notes Due 2016 [Member]
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Jan. 13, 2006
6 5/8% Senior Notes Due 2016 [Member]
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Dec. 31, 2011
GO Zone 6 1/2% Senior Notes Due 2029 [Member]
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Dec. 31, 2010
GO Zone 6 1/2% Senior Notes Due 2029 [Member]
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Dec. 31, 2011
GO Zone 6 3/4% Senior Notes Due 2032 [Member]
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Dec. 31, 2010
GO Zone 6 3/4% Senior Notes Due 2032 [Member]
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Dec. 31, 2011
GO Zone 6 1/2% Tax-Exempt Revenue Bonds Due 2035 [Member]
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Dec. 31, 2010
GO Zone 6 1/2% Tax-Exempt Revenue Bonds Due 2035 [Member]
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Dec. 31, 2011
IKE Zone 6 1/2% Tax-Exempt Revenue Bonds Due 2035 [Member]
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Dec. 31, 2010
IKE Zone 6 1/2% Tax-Exempt Revenue Bonds Due 2035 [Member]
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Dec. 31, 1997
Waste Disposal Revenue Bonds Due 2027 [Member]
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Dec. 31, 2011
Waste Disposal Revenue Bonds Due 2027 [Member]
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Dec. 31, 2010
Waste Disposal Revenue Bonds Due 2027 [Member]
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|
| Debt Instrument [Line Items] | |||||||||||||||||
| Senior notes | $ 249,674 | $ 249,593 | $ 100,000 | $ 100,000 | $ 250,000 | $ 250,000 | $ 89,000 | $ 89,000 | $ 65,000 | $ 65,000 | |||||||
| Non-current loan payable | 10,889 | 10,889 | |||||||||||||||
| Long-term debt | $ 764,563 | $ 764,482 | |||||||||||||||
| Stated interest rate | 6.625% | 6.625% | 6.625% | 6.50% | 6.50% | 6.75% | 6.75% | 6.50% | 6.50% | 6.50% | 6.50% | ||||||
| Maturity | 2016 | 2016 | 2016 | 2029 | 2032 | 2035 | 2035 | December 2027 | 2027 |