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Income Taxes (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Provision for income taxes | $ 30,019,000 | $ 29,435,000 | $ 88,160,000 | $ 82,003,000
Effective tax rate | 26.40% | 29.60% | 26.60% | 27.70%
Foreign withholding taxes |  | $ 5,200,000 |  |
Minimum |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Reasonably possible change in unrecognized tax benefits over next 12 months | $ 0 |  | $ 0 |
Maximum |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Reasonably possible change in unrecognized tax benefits over next 12 months | $ 1,400,000 |  | $ 1,400,000 |

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