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Income Taxes Income Tax (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Valuation Allowance [Line Items] |  |  |  |
Provision for income taxes | $ 9,034 | $ 8,535 | $ 14,560 | $ 14,659
Effective Income Tax Rate Reconciliation, Percent | 36.20% | 39.00% | 36.70% | 39.00%

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