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Income Taxes Income Tax (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Valuation Allowance [Line Items] |  |  |  |
Provision for income taxes | $ 7,501 | $ 10,928 | $ 22,061 | $ 25,587
Effective Income Tax Rate Reconciliation, Percent | 40.70% | 41.20% | 38.00% | 39.90%

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