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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule of Stock Repurchase Activity | A summary of the stock repurchase activity under the stock repurchase program, reported based on the trade date, is summarized as follows:
(DOLLARS IN THOUSANDS) |  | Shares Repurchased |  | Weighted- Average Price per Share |  | Dollar Amount Repurchased
Year Ended December 31, 2018 |  | 108,109 |  |  | $ | 143.15 |  |  | $ | 15,475 |
Year Ended December 31, 2017 |  | 459,264 |  |  | 126.44 |  |  | 58,069 |

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