| **Income Taxes (Tax effects of temporary differences) (Details) (USD $)In Thousands, unless otherwise specified**    | Dec. 31, 2013 | Dec. 31, 2012 |
|----------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Current deferred tax assets, net of current deferred tax liability:**                                              |          |          |
| Net operating loss carryforwards                                                                                     | $ 30,344      | $ 3,952       |
| Compensated absences, accrued for financial reporting purposes                                                       | 2,956         | 2,605         |
| Workers compensation and self-insurance health reserves, principally due to accrual for financial reporting purposes | 1,688         | 1,357         |
| Accounts receivable, principally due to allowance for doubtful receivables                                           | 1,154         | 1,319         |
| Deferred compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes      | 104           | 32            |
| Deferred revenue for financial reporting purposes                                                                    | 2,673         | 2,734         |
| Other                                                                                                                | 834           | 898           |
| Total current deferred tax assets                                                                                    | 39,753        | 12,897        |
| **Long-term deferred tax assets:**                                                                                   |          |          |
| Net operating loss carryforwards                                                                                     | 90,589        | 116,034       |
| Deferred revenue for financial reporting purposes                                                                    | 35,506        | 36,316        |
| Alternative minimum tax credits                                                                                      | 1,895         | 1,895         |
| Deferred compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes      | 2,556         | 2,543         |
| Asset retirement obligations in excess of amounts recognized for tax purposes                                        | 4,930         | 6,680         |
| Share-based compensation expense for financial reporting purposes in excess of amounts recognized for tax purposes   | 1,860         | 1,675         |
| Other                                                                                                                | 4,335         | 3,353         |
| Total long-term deferred tax assets                                                                                  | 141,671       | 168,496       |
| **Long-term deferred tax liabilities:**                                                                              |          |          |
| Plant and equipment, principally due to differences in depreciation                                                  | 212,719       | 233,530       |
| Intangible assets                                                                                                    | 49,761        | 58,627        |
| Flow-through entity deferred tax items                                                                               | 40,667        | 0             |
| Total long-term deferred tax liabilities                                                                             | 303,147       | 292,157       |
| Net long-term deferred tax liabilities                                                                               | $ 161,476     | $ 123,661     |

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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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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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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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