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Income Taxes Income Tax (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Valuation Allowance [Line Items] |  |  |  |
Provision for income taxes | $ 10,957 | $ 5,620 | $ 16,713 | $ 11,430
Effective Income Tax Rate Reconciliation, Percent | 26.60% | 16.80% | 25.80% | 19.90%
Effective Income Tax Rate Reconciliation, Tax Credit, Amount |  | $ 3,000 |  |

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