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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Treasury Stock Acquisition | Treasury stock acquisitions during the six months ended June 30, 2023 were as follows (dollars in thousands):
| Shares |  |  | Cost |
Treasury shares at January 1, 2023 |  | 88,758,722 |  |  | $ | 1,453,079 |
Purchases pursuant to stock buyback program |  | 7,426,044 |  |  |  | 93,276 |
Acquisitions pursuant to long-term incentive plan |  | 749,284 |  |  |  | 8,351 |
Treasury shares at June 30, 2023 |  | 96,934,050 |  |  | $ | 1,554,706 |

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