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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Provision for Income Taxes | $ 17,539 | $ 28,815 | $ 48,018 | $ 69,566
Effective Income Tax Rate Reconciliation, Percent | 23.00% | 32.00% | 16.00% | 28.00%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent | 12.00% |  | 12.00% |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount |  |  | $ 22,830 | $ 23,663
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent |  |  | 8.00% | 9.00%
Increase (Decrease) In Deferred Tax Assets Associated With Changes In Unrealized Gain Loss On Marketable Securities In Accumulated Other Comprehensive Income Loss |  |  | $ 133 | $ (218)
Increase (Decrease) In Deferred Tax Assets Associated With Changes In Foreign Currency Translation Adjustment Gain Loss In Accumulated Other Comprehensive Income Loss |  |  | $ 73 | $ (3,244)

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