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Changes in Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Oct. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at start of the period | $ 915,719 | $ 897,515 | $ 867,543 | $ 821,782 | $ 864,252 | $ 877,605 | $ 867,543 | $ 877,605 |
Net income | 27,154 | 26,826 | 27,086 | 10,823 | 39,369 | 28,075 | 81,066 | 78,267 |
Compensation and benefits paid or payable in shares | 2,914 | 811 | 378 | 835 | 902 | 745 |  |  |
Options exercised |  |  |  | 10 |  | 7 |  |  |
Shares issued to Directors' |  | 1,086 |  |  | 1,085 |  |  |  |
Purchase of Treasury shares |  |  |  |  | (41,128) | (43,937) |  |  |
Initial equity related to Noncontrolling interest in Arcari | 1,632 |  |  |  |  |  |  |  |
Cumulative translation adjustments | (15,784) | (2,389) | 14,119 | (38,506) | (39,752) | (1,674) |  |  |
Pension and postretirement liability adjustments | 34 | (724) | (916) | (629) | 234 | 74 |  |  |
Settlement of certain pension liabilities |  |  |  | 26,198 |  |  |  | 26,198 |
Derivative valuation adjustment | (2,237) | 389 | (2,902) | 6,208 | 3,349 | 10,018 |  |  |
Balance at end of the period | $ 921,633 | 915,719 | $ 897,515 | $ 820,188 | 821,782 | 864,252 | $ 921,633 | $ 820,188 |
Dividends declared per Class A share (in dollars per share) | $ 0.25 |  |  | $ 0.21 |  |  | $ 0.75 | $ 0.63 |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 200,000
Common Class A |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Treasury stock, balance at the beginning of the period (in shares) |  |  | 9,674,542 |  |  |  | 9,674,542 |  |
Dividends declared | $ (7,799) | $ (7,795) | $ (7,792) | $ (6,533) | $ (6,529) | $ (6,661) |  |  |
Treasury stock, balance at the end of the period (in shares) | 9,661,845 |  |  |  |  |  | 9,661,845 |  |
Dividends declared per Class A share (in dollars per share) | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.21 | $ 0.21 | $ 0.21 |  |  |
Common Stock | Common Class A |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Common stock, balance at the beginning of the period (in shares) | 40,842,000 | 40,842,000 | 40,785,000 | 40,785,000 | 40,781,000 | 40,760,000 | 40,785,000 | 40,760,000 |
Balance at start of the period | $ 41 | $ 41 | $ 41 | $ 41 | $ 41 | $ 41 | $ 41 | $ 41 |
Compensation and benefits paid or payable in shares (in shares) | 15,000 |  | 58,000 |  | 4,000 | 21,000 |  |  |
Common stock, balance at the end of the period (in shares) | 40,857,000 | 40,842,000 | 40,842,000 | 40,785,000 | 40,785,000 | 40,781,000 | 40,857,000 | 40,785,000 |
Balance at end of the period | $ 41 | $ 41 | $ 41 | $ 41 | $ 41 | $ 41 | $ 41 | $ 41 |
Additional paid-in capital |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at start of the period | 443,556 | 441,917 | 441,540 | 439,450 | 437,748 | 436,996 | 441,540 | 436,996 |
Compensation and benefits paid or payable in shares | 2,914 | 811 | 378 | 835 | 902 | 745 |  |  |
Options exercised |  |  |  | 10 |  | 7 |  |  |
Shares issued to Directors' |  | 828 |  |  | 800 |  |  |  |
Balance at end of the period | 446,470 | 443,556 | 441,917 | 440,295 | 439,450 | 437,748 | 446,470 | 440,295 |
Retained earnings |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at start of the period | 969,292 | 950,415 | 931,318 | 916,805 | 884,133 | 863,057 | 931,318 | 863,057 |
Net income | 27,109 | 26,672 | 26,889 | 10,694 | 39,201 | 27,737 |  |  |
Balance at end of the period | 988,602 | 969,292 | 950,415 | 920,966 | 916,805 | 884,133 | 988,602 | 920,966 |
Retained earnings | Common Class A |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Dividends declared | (7,799) | (7,795) | (7,792) | (6,533) | (6,529) | (6,661) |  |  |
Accumulated items of other comprehensive income |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at start of the period | (137,767) | (134,864) | (144,927) | (173,700) | (137,622) | (145,984) | (144,927) | (145,984) |
Cumulative translation adjustments | (15,639) | (2,568) | 13,881 | (38,450) | (39,661) | (1,730) |  |  |
Pension and postretirement liability adjustments | 34 | (724) | (916) | (629) | 234 | 74 |  |  |
Settlement of certain pension liabilities |  |  |  | 26,198 |  |  |  |  |
Derivative valuation adjustment | (2,237) | 389 | (2,902) | 6,208 | 3,349 | 10,018 |  |  |
Balance at end of the period | (155,609) | (137,767) | (134,864) | (180,373) | (173,700) | (137,622) | (155,609) | (180,373) |
Treasury Stock |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at start of the period | $ (364,665) | $ (364,923) | $ (364,923) | $ (364,923) | $ (324,080) | $ (280,143) | $ (364,923) | $ (280,143) |
Treasury stock, balance at the beginning of the period (in shares) | 9,663,000 | 9,675,000 | 9,675,000 | 9,675,000 | 9,180,000 | 8,665,000 | 9,675,000 | 8,665,000 |
Compensation and benefits paid or payable in shares | $ 1 |  |  |  |  |  |  |  |
Shares issued to Directors' (in shares) |  | (12,000) |  |  | (13,000) |  |  |  |
Shares issued to Directors' |  | $ 258 |  |  | $ 285 |  |  |  |
Purchase of Treasury shares (in shares) |  |  |  |  | 508,000 | 515,000 | 0 | 1,022,717 |
Purchase of Treasury shares |  |  |  |  | $ (41,128) | $ (43,937) |  | $ (85,100) |
Balance at end of the period | $ (364,665) | $ (364,665) | $ (364,923) | $ (364,923) | $ (364,923) | $ (324,080) | $ (364,665) | $ (364,923) |
Treasury stock, balance at the end of the period (in shares) | 9,662,000 | 9,663,000 | 9,675,000 | 9,675,000 | 9,675,000 | 9,180,000 | 9,662,000 | 9,675,000 |
Noncontrolling Interest |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at start of the period | $ 5,262 | $ 4,929 | $ 4,494 | $ 4,109 | $ 4,032 | $ 3,638 | $ 4,494 | $ 3,638 |
Net income | 45 | 154 | 197 | 129 | 168 | 338 |  |  |
Initial equity related to Noncontrolling interest in Arcari | 1,632 |  |  |  |  |  |  |  |
Cumulative translation adjustments | (145) | 179 | 238 | (56) | (91) | 56 |  |  |
Balance at end of the period | $ 6,794 | $ 5,262 | $ 4,929 | $ 4,182 | $ 4,109 | $ 4,032 | $ 6,794 | $ 4,182 |

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