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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |
Provisional tax expense |  | $ 172,100 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | $ 12,962 |  | $ 27,122 |
Gross unrecognized tax benefits | 40,300 | $ 48,604 | 30,554 | $ 21,502
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 21,600 |  | 19,700 |
Unrecognized tax benefits, income tax penalties and interest accrued | 6,500 |  | $ 5,800 |
Possible decrease in unrecognized tax benefits | $ 23,000 |  |  |
Maximum |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
IncomeTaxNetOperatingLossCarryforwardPeriod | 20 years |  |  |
2019 - 2023 [Member] | State and Local Jurisdiction [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 35,900 |  |  |
2024 - Thereafter [Member] | State and Local Jurisdiction [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 164,800 |  |  |

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