| **Long-Term Debt Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands** | 3 Months Ended | 9 Months Ended |          |
|----------------------------------------------------------------------------------|----------------|----------------|----------|
||
| Gross interest expense                                                           | $ 10,400       | $ 13,700       | $ 31,900 | $ 41,100 |   |
| Long-term Debt                                                                   | 629,178        | 636,749        | 629,178  | 636,749 | $ 816,830 |
| Amortization of deferred financing costs                                         | 200            | 400            | 700      | 1,100 |   |
| Interest costs incurred, capitalized                                             | 0              | 0              | 0        | 0 |   |
| Industrial Development Bonds [Member]                                            |           |           |     |   |   |
| Long-term Debt                                                                   | $ 0            | $ 215,000      | $ 0      | $ 215,000 | $ 0 |

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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest capitalized during the period.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense for debt.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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