| **Income Taxes (Tax effects of temporary differences) (Details) (USD $)In Thousands, unless otherwise specified**    | Dec. 31, 2012 | Dec. 31, 2011 |
|----------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Income Tax Temporary Differences [Line Items]**                                                                    |          |          |
| Alternative minimum tax credits                                                                                      | $ 1,900       |          |
| Deferred Tax Assets, Total                                                                                           | 12,897        | 15,555        |
| Net long-term deferred tax liabilities                                                                               | 123,661       | 114,234       |
| Current [Member]                                                                                                     |          |          |
| **Income Tax Temporary Differences [Line Items]**                                                                    |          |          |
| Net operating loss carryforwards                                                                                     | 3,952         | 7,796         |
| Compensated absences, accrued for financial reporting purposes                                                       | 2,605         | 2,664         |
| Workers compensation and self insurance health reserves, principally due to accrual for financial reporting purposes | 1,357         | 1,068         |
| Accounts receivable, principally due to allowance for doubtful receivables                                           | 1,319         | 2,379         |
| Deferred compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes      | 32            | 131           |
| Other                                                                                                                | 898           | 155           |
| Deferred Revenue for financial reporting purposes                                                                    | 2,734         | 1,362         |
| Long-term [Member]                                                                                                   |          |          |
| **Income Tax Temporary Differences [Line Items]**                                                                    |          |          |
| Net operating loss carryforwards                                                                                     | 116,034       | 119,762       |
| Deferred compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes      | 2,543         | 2,581         |
| Other                                                                                                                | 3,353         | 469           |
| Deferred Revenue for financial reporting purposes                                                                    | 36,316        | 18,097        |
| Alternative minimum tax credits                                                                                      | 1,895         | 1,895         |
| Asset retirement obligations in excess of amounts recognized for tax purposes                                        | 6,680         | 6,248         |
| Share-based compensation expense for financial reporting purposes in excess of amounts recognized for tax purposes   | 1,675         | 4,394         |
| Deferred Tax Assets, Total                                                                                           | 168,496       | 153,446       |
| Plant and equipment, principally due to differences in depreciation                                                  | 233,530       | 211,172       |
| Intangible assets                                                                                                    | 58,627        | 56,508        |
| Total long-term deferred tax liabilities                                                                             | $ 292,157     | $ 267,680     |

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| - Definition
Amount before allocation of valuation allowances of deferred tax liability to taxable temporary differences.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.
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| - Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.
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| - Definition
The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensated absences (includes, but not limited to, sick and personal days).
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from asset retirement obligations. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from estimated losses under self insurance.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.
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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
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