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Changes in Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance at start of the period | $ 967,320 | $ 867,543
Net income | 27,369 | 27,086
Compensation and benefits paid or payable in shares | 810 | 378
Cumulative translation adjustments | (12,070) | 14,119
Pension and postretirement liability adjustments | 382 | (916)
Derivative valuation adjustment | (2,124) | (2,902)
Balance at end of the period | $ 973,565 | $ 897,515
Dividends declared per Class A share (in dollars per share) | $ 0.26 | $ 0.25
Common Class A |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Treasury stock, balance at the beginning of the period (in shares) | 9,661,845 |
Dividends declared | $ (8,122) | $ (7,792)
Treasury stock, balance at the end of the period (in shares) | 9,661,845 |
Dividends declared per Class A share (in dollars per share) | $ 0.26 | $ 0.25
Common Stock | Common Class A |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Common stock, balance at the beginning of the period (in shares) | 40,856,000 | 40,785,000
Balance at start of the period | $ 41 | $ 41
Compensation and benefits paid or payable in shares (in shares) | 42,000 | 58,000
Common stock, balance at the end of the period (in shares) | 40,898,000 | 40,842,000
Balance at end of the period | $ 41 | $ 41
Additional paid-in capital |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance at start of the period | 448,218 | 441,540
Compensation and benefits paid or payable in shares | 810 | 378
Balance at end of the period | 449,028 | 441,917
Retained earnings |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance at start of the period | 1,010,942 | 931,318
Net income | 27,291 | 26,889
Balance at end of the period | 1,030,111 | 950,415
Retained earnings | Common Class A |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Dividends declared | (8,122) | (7,792)
Accumulated items of other comprehensive income |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance at start of the period | (133,168) | (144,927)
Cumulative translation adjustments | (12,116) | 13,881
Pension and postretirement liability adjustments | 382 | (916)
Derivative valuation adjustment | (2,124) | (2,902)
Balance at end of the period | (147,026) | (134,864)
Treasury Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance at start of the period | $ (364,665) | $ (364,923)
Treasury stock, balance at the beginning of the period (in shares) | 9,662,000 | 9,675,000
Balance at end of the period | $ (364,665) | $ (364,923)
Treasury stock, balance at the end of the period (in shares) | 9,662,000 | 9,675,000
Noncontrolling Interest |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance at start of the period | $ 5,952 | $ 4,494
Net income | 78 | 197
Cumulative translation adjustments | 46 | 238
Balance at end of the period | $ 6,076 | $ 4,929

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