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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Common Stock Activity | Common stock activity is summarized as follows:
|  | Shares |  | Dollars |  |
(Dollars in thousands) |  | Issued |  | Treasury |  | Common Stock |  | Treasury Cost |  |
Balance at January 1, 2021 |  | 62,081,391 |  |  | (23,013,489) |  |  | $ | 242,693 |  |  | $ | (326,156) |  |  |
Restricted stock awards |  | — |  |  | 53,934 |  |  | (762) |  |  | 762 |  |  |
Restricted stock expense |  | — |  |  | — |  |  | 6,562 |  |  | — |  |  |
Restricted stock forfeitures |  | — |  |  | — |  |  | (765) |  |  | — |  |  |
Stock options exercised |  | — |  |  | 122,119 |  |  | 4,003 |  |  | 1,767 |  |  |
Stock option expense |  | — |  |  | — |  |  | 90 |  |  | — |  |  |
Stock option forfeitures |  | — |  |  | — |  |  | (9) |  |  | — |  |  |
Performance stock issued |  | — |  |  | 64,543 |  |  | (939) |  |  | 939 |  |  |
Performance stock expense |  | — |  |  | — |  |  | 13,227 |  |  | — |  |  |
Employee stock purchase plan |  | — |  |  | 5,730 |  |  | 772 |  |  | 83 |  |  |
Treasury shares purchased |  | — |  |  | (37,710) |  |  | — |  |  | (6,171) |  |  |
Acquisition of noncontrolling interest |  | — |  |  | — |  |  | (4,751) |  |  | — |  |  |
Balances December 31, 2021 |  | 62,081,391 |  |  | (22,804,873) |  |  | $ | 260,121 |  |  | $ | (328,776) |  |  |
Restricted stock awards |  | — |  |  | 52,810 |  |  | (711) |  |  | 711 |  |  |
Restricted stock expense |  | — |  |  | — |  |  | 7,715 |  |  | — |  |  |
Restricted stock forfeitures |  | — |  |  | — |  |  | (1,227) |  |  | — |  |  |
Stock options exercised |  | — |  |  | 103,545 |  |  | 3,021 |  |  | 1,629 |  |  |
Stock option expense |  | — |  |  | — |  |  | 49 |  |  | — |  |  |
Performance stock issued |  | — |  |  | 55,447 |  |  | (880) |  |  | 880 |  |  |
Performance stock expense |  | — |  |  | — |  |  | 15,843 |  |  | — |  |  |
Performance stock forfeitures |  | — |  |  | — |  |  | (2,730) |  |  | — |  |  |
Employee stock purchase plan |  | — |  |  | 7,412 |  |  | 779 |  |  | 112 |  |  |
Treasury shares purchased |  | — |  |  | (31,260) |  |  | — |  |  | (4,021) |  |  |
Share repurchase program |  | — |  |  | (251,408) |  |  | — |  |  | (30,373) |  |  |
Balances December 31, 2022 |  | 62,081,391 |  |  | (22,868,327) |  |  | $ | 281,980 |  |  | $ | (359,838) |  |  |
Restricted stock awards |  | — |  |  | 40,856 |  |  | (643) |  |  | 643 |  |  |
Restricted stock expense |  | — |  |  | — |  |  | 9,476 |  |  | — |  |  |
Restricted stock forfeitures |  | — |  |  | — |  |  | (1,414) |  |  | — |  |  |
Stock options exercised |  | — |  |  | 31,394 |  |  | 970 |  |  | 503 |  |  |
Stock option expense |  | — |  |  | — |  |  | 11 |  |  | — |  |  |
Stock option forfeitures |  | — |  |  | — |  |  | (11) |  |  | — |  |  |
Performance stock issued |  | — |  |  | 53,407 |  |  | (855) |  |  | 855 |  |  |
Performance stock expense |  | — |  |  | — |  |  | 23,546 |  |  | — |  |  |
Performance stock forfeitures |  | — |  |  | — |  |  | (1,585) |  |  | — |  |  |
Employee stock purchase plan |  | — |  |  | 7,140 |  |  | 849 |  |  | 114 |  |  |
Treasury shares purchased |  | — |  |  | (28,649) |  |  | — |  |  | (3,961) |  |  |
Balances December 31, 2023 |  | 62,081,391 |  |  | (22,764,179) |  |  | $ | 312,324 |  |  | $ | (361,684) |  |  |

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