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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Deferred Tax Assets and Liabilities [Abstract] |  |
Non-current deferred tax liability | $ 121,262 | $ 86,657
Net deferred tax liability | 121,262 | 86,657
Deferred tax assets |  |
Federal net operating loss carryforwards | 102,806 | 110,350
State net operating loss carryforwards | 55,478 | 45,096
Share-based compensation | 15,127 | 14,226
Other | 53,434 | 35,161
Gross deferred tax assets | 226,845 | 204,833
Valuation allowance | (39,516) | (28,821)
Deferred tax assets, net of valuation allowance | 187,329 | 176,012
Deferred tax liabilities |  |
Difference between book and tax basis of property and intangible assets | 259,495 | 219,090
State tax liability | 38,891 | 33,777
Other | 10,205 | 9,802
Gross deferred tax liabilities | 308,591 | $ 262,669
State and Local Jurisdiction |  |
Deferred tax assets |  |
Federal net operating loss carryforwards | 936,500 |
Alternative Minimum Tax Credit Carryforward [Member] | Internal Revenue Service (IRS) |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards | $ 11,000 |

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