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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Treasury Stock Acquisition | Treasury stock acquisitions during the six months ended June 30, 2021 were as follows (dollars in thousands):
| Shares |  |  | Cost |
Treasury shares at beginning of period |  | 83,402,322 |  |  | $ | 1,366,313 |
Acquisitions pursuant to long-term incentive plan |  | 428,665 |  |  |  | 3,522 |
Treasury shares at end of period |  | 83,830,987 |  |  | $ | 1,369,835 |

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