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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |  |
Provisional tax expense |  | $ 172,100 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | $ 27,122 | 41,282 |  |
Gross unrecognized tax benefits | 30,554 | 48,604 | $ 21,502 | $ 38,992
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 19,700 | 23,400 |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 5,800 | $ 4,900 |  |
Possible decrease in unrecognized tax benefits | $ 16,600 |  |  |
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 | $ 32,600 |  |  |
2024 - Thereafter [Member] | State and Local Jurisdiction [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 196,400 |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 18,600 |

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