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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017
Income Taxes [Line Items] |  |
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities, Portion Which Affected Effective Tax Rate | $ 19,500 |
Deferred Tax Assets and Liabilities [Abstract] |  |
Non-current deferred tax liability | 81,454 | $ 86,657
Net deferred tax liability | 81,454 | 86,657
Deferred tax assets |  |
Federal net operating loss carryforwards | 201,978 | 110,350
State net operating loss carryforwards | 38,715 | 45,096
Share-based compensation | 26,344 | 14,226
Other | 63,815 | 35,161
Gross deferred tax assets | 330,852 | 204,833
Valuation allowance | (28,402) | (28,821)
Deferred tax assets, net of valuation allowance | 302,450 | 176,012
Deferred tax liabilities |  |
Difference between book and tax basis of property and intangible assets | 337,654 | 219,090
State tax liability | 31,443 | 33,777
Other | 14,807 | 9,802
Gross deferred tax liabilities | 383,904 | 262,669
State and Local Jurisdiction |  |
Deferred tax assets |  |
Federal net operating loss carryforwards |  | 732,400
All years [Member] |  |
Income Taxes [Line Items] |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 27,700 |
Alternative Minimum Tax Credit Carryforward [Member] | Internal Revenue Service (IRS) |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards |  | $ 10,400

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