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Income Taxes (Schedule of Operating Loss and Tax Credit Carryforwards) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Deferred tax assets after valuation allowance | $ 353,215 | $ 297,016
General business credits-federal | 64,835 | 80,048
Federal loss carryforwards | 62,010 | 175
State loss carryforwards | 19,801 | $ 19,438
Expiring 2031-2037 |  |
Tax Credit Carryforward [Line Items] |  |
General business credits-federal | 64,835 |
Expiring 2027-2035 |  |
Tax Credit Carryforward [Line Items] |  |
Federal loss carryforwards | 62,010 |
Expiring 2018-2022 |  |
Tax Credit Carryforward [Line Items] |  |
State loss carryforwards | 1,092 |
Expiring 2023-2035 |  |
Tax Credit Carryforward [Line Items] |  |
State loss carryforwards | 18,709 |
Domestic Tax Authority |  |
Tax Credit Carryforward [Line Items] |  |
Deferred tax assets after valuation allowance | 126,800 |
State and Local Jurisdiction |  |
Tax Credit Carryforward [Line Items] |  |
Deferred tax assets after valuation allowance | $ 19,800 |

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