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Income Taxes (Schedule of Income Tax Expense and Effective Tax Rate) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Income before income taxes | $ 206,367 | $ 204,865 | $ 624,635 | $ 613,641
Income before incomes taxes, % change | 1.00% |  | 2.00% |
Income tax expense | $ 34,951 | $ 33,563 | $ 138,815 | $ 82,958
Income tax expense, % change | 4.00% |  | 67.00% |
Effective tax rate (as a percent) | 16.90% | 16.40% | 22.20% | 13.50%

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