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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2019
Income Tax Disclosure [Abstract] |
Income Tax Expense From Continuing Operations And The Effective Tax Rate | The following table presents Income tax expense and the effective tax rate:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (Dollars in thousands)
Income tax expense | $ | 42,960 |  |  | $ | 36,527 |  |  | $ | 70,257 |  |  | $ | 54,699 |
Effective tax rate | 23 | % |  | 22 | % |  | 18 | % |  | 17 | %

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- Definition Schedule of Effective Income Tax Rate and Expenses [Table Text Block] + References No definition available. + Details
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