| **Income Taxes (Tax Effects of Temporary Differences) (Details) - USD ($) $ in Thousands**                           | Dec. 31, 2016 | Dec. 31, 2015 |
|----------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Deferred tax assets:**                                                                                             |          |          |
| Net operating loss carryforwards                                                                                     | $ 111,236     | $ 139,238     |
| Deferred revenue for financial reporting purposes                                                                    | 59,993        | 41,151        |
| Asset retirement obligations in excess of amounts recognized for tax purposes                                        | 16,808        | 14,338        |
| Compensated absences accrued for financial reporting purposes                                                        | 3,505         | 3,339         |
| Share-based compensation expense for financial reporting purposes in excess of amounts recognized for tax purposes   | 3,393         | 2,773         |
| Accounts receivable, principally due to allowance for doubtful receivables                                           | 1,965         | 1,912         |
| Workers compensation and self-insurance health reserves, principally due to accrual for financial reporting purposes | 1,705         | 1,795         |
| Alternative minimum tax credits                                                                                      | 1,735         | 1,735         |
| Deferred compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes      | 1,687         | 1,603         |
| Other                                                                                                                | 11,515        | 13,144        |
| Total deferred tax assets                                                                                            | 213,542       | 221,028       |
| **Deferred tax liabilities:**                                                                                        |          |          |
| Plant and equipment, principally due to differences in depreciation                                                  | 245,118       | 246,172       |
| Intangible assets                                                                                                    | 106,061       | 79,255        |
| Other                                                                                                                | 345           | 1,746         |
| Total deferred tax liabilities                                                                                       | 351,524       | 327,173       |
| Net deferred tax liabilities                                                                                         | $ 137,982     | $ 106,145     |

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards classified as noncurrent.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.
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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.
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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 employee compensation.
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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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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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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.
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Gross amount of noncurrent deferred tax liabilities, which result from applying the applicable tax rate to taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax.
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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
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