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Income Taxes Unrecognized Tax Benefits Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |
Unrecognized Tax Benefits | $ 3,020 | $ 3,370 | $ 3,570
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 2,500 | 2,800 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 1,800 | $ 1,700 |
Minimum [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Open Tax Year | 2018 |  |
Maximum [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Open Tax Year | 2011 |  |

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