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Income Taxes Unrecognized tax expense (benefit) roll forward (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized Tax Benefits | $ 62,027 | $ 61,470 | $ 63,086 | $ 23,417
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 1,678 | 3,080 | 3,037 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 1,121 | $ (4,696) | (458) |
Unrecognized Tax Benefits, Increase Resulting from Acquisition |  |  | $ 37,090 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 52,700 |  |  |

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