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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2019
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Expense and Effective Tax Rate | The following table presents the income tax expense and the effective tax rate for the three and six months ended June 30, 2019 and 2018:
($ in thousands) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | % Change |  | 2019 |  | 2018 |  | % Change
Income before income taxes |  | $ | 223,177 |  |  | $ | 196,992 |  |  | 13 | % |  | $ | 418,268 |  |  | $ | 408,776 |  |  | 2 | %
Income tax expense |  | $ | 72,797 |  |  | $ | 24,643 |  |  | 195 | % |  | $ | 103,864 |  |  | $ | 49,395 |  |  | 110 | %
Effective tax rate |  | 32.6 | % |  | 12.5 | % |  | 20 | % |  | 24.8 | % |  | 12.1 | % |  | 13 | %

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