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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |  |
Potential equity impact of deferred taxes | $ 14,900 |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0 |  | $ 0
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities, Portion Which Affected Effective Tax Rate |  | $ 19,700 |
Deferred Tax Assets and Liabilities [Abstract] |  |  |
Current deferred tax liability | 0 | 3,087 |
Non-current deferred tax liability | 162,189 | 142,263 |
Current deferred tax asset | 0 | (117) |
Net deferred tax liability | 162,189 | 145,233 |
Deferred tax assets |  |  |
Federal net operating loss carryforwards | 308,738 | 312,113 |
State net operating loss carryforwards | 47,711 | 41,395 |
Share-based compensation | 32,524 | 35,122 |
Other | 43,936 | 42,554 |
Gross deferred tax assets | 432,909 | 431,184 |
Valuation allowance | (247,761) | (261,962) |
Deferred tax assets, net of valuation allowance | 185,148 | 169,222 |
Deferred tax liabilities |  |  |
Difference between book and tax basis of intangible assets | 216,655 | 202,089 |
Difference between book and tax basis of property | 105,732 | 86,280 |
State tax liability, net of federal benefit | 13,428 | 11,980 |
Other | 11,522 | 14,106 |
Gross deferred tax liabilities | 347,337 | 314,455 |
State and Local Jurisdiction |  |  |
Deferred tax assets |  |  |
Federal net operating loss carryforwards | 653,500 |  |
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 | $ 1,100 |  |

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