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Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
|---|---|---|
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Mar. 31, 2012
|
Dec. 31, 2011
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|
| Debt Instrument [Line Items] | ||
| Long-term debt | $ 764,583 | $ 764,563 |
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6 5/8% Senior Notes Due 2016 [Member]
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| Debt Instrument [Line Items] | ||
| Senior notes | 249,694 | 249,674 |
| Stated interest rate | 6.625% | |
| Maturity | 2016 | |
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6 1/2% Senior Notes Due 2029 [Member]
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||
| Debt Instrument [Line Items] | ||
| Senior notes | 100,000 | 100,000 |
| Stated interest rate | 6.50% | |
| Maturity | 2029 | |
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6 3/4% Senior Notes Due 2032 [Member]
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| Debt Instrument [Line Items] | ||
| Senior notes | 250,000 | 250,000 |
| Stated interest rate | 6.75% | |
| Maturity | 2032 | |
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2035 GO Zone 6 1/2% Notes [Member]
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||
| Debt Instrument [Line Items] | ||
| Senior notes | 89,000 | 89,000 |
| Stated interest rate | 6.50% | |
| Maturity | 2035 | |
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2035 IKE Zone 6 1/2% Notes [Member]
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| Debt Instrument [Line Items] | ||
| Senior notes | 65,000 | 65,000 |
| Stated interest rate | 6.50% | |
| Maturity | 2035 | |
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Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 [Member]
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| Debt Instrument [Line Items] | ||
| Non-current loan payable | $ 10,889 | $ 10,889 |
| Maturity | 2027 |