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Income Taxes Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Tax Examination [Line Items] |  |  |  |  |
Effective income tax rate reconciliation, percent | 30.00% | 50.00% | 42.00% | 5.00% |
Unrecognized tax benefits | $ 115,282 |  | $ 115,282 |  | $ 112,558
Effective income tax rate reconciliation, at federal statutory income tax rate, percent | 21.00% | 21.00% | 21.00% |  |
Minimum [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Open tax year |  |  | 2010 |  |
Maximum [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Open tax year |  |  | 2017 |  |

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