v3.26.1
Changes in Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Feb. 21, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at start of the period $ 735,415 $ 905,168 $ 732,102 $ 948,947  
Net income 17,704 9,332 33,153 26,681  
Compensation and benefits paid or payable in shares   243   2,894  
Taxes paid in lieu of share issuance (30)   (1,333)    
Stock-based compensation 2,667   4,127    
Shares issued to Directors 882 760 882 760  
Purchase of Treasury shares   (51,295)   (120,448)  
Share repurchase excise tax adjustment 146   146    
Dividends paid to noncontrolling interests       (88)  
Cumulative translation adjustments 2,567 38,902 (2,686) 55,916  
Pension and postretirement liability adjustments 262 (855) 846 (3,517)  
Derivative valuation adjustment and other 420 (122) 735 (750)  
Balance at end of the period $ 752,089 $ 894,109 $ 752,089 $ 894,109  
Dividends declared per Class A share (in dollars per share) $ 0.28 $ 0.27 $ 0.56 $ 0.54  
Stock repurchase program, authorized amount         $ 250,000
Common Class A          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Treasury stock, balance at the beginning of the period (in shares)     12,685,782    
Dividends $ (7,944) $ (8,024) $ (15,883) $ (16,286)  
Treasury stock, balance at the end of the period (in shares) 12,685,782   12,685,782    
Dividends declared per Class A share (in dollars per share) $ 0.28 $ 0.27 $ 0.56 $ 0.54  
Class A Common Stock | Common Class A          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock, balance at the beginning of the period (in shares) 41,041,000 40,973,000 40,989,000 40,917,000  
Balance at start of the period $ 41 $ 41 $ 41 $ 41  
Compensation and benefits paid or payable in shares (in shares)       56,000  
Stock issued under incentive compensation plans (in shares) 1,000   53,000    
Shares issued to Directors' (in shares) 15,000 11,000 15,000 11,000  
Common stock, balance at the end of the period (in shares) 41,057,000 40,984,000 41,057,000 40,984,000  
Balance at end of the period $ 41 $ 41 $ 41 $ 41  
Additional paid-in capital          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at start of the period 460,629 455,584 460,472 452,933  
Compensation and benefits paid or payable in shares   243   2,894  
Taxes paid in lieu of share issuance (30)   (1,333)    
Stock-based compensation 2,667   4,127    
Shares issued to Directors 882 760 882 760  
Balance at end of the period 464,148 456,587 464,148 456,587  
Retained  earnings          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at start of the period 983,704 1,074,863 976,373 1,065,763  
Net income 17,414 9,183 32,695 26,538  
Derivative valuation adjustment and other (4) (88) (15) (81)  
Balance at end of the period 993,170 1,075,934 993,170 1,075,934  
Retained  earnings | Common Class A          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Dividends (7,944) (8,024) (15,883) (16,286)  
Accumulated items of other comprehensive income          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at start of the period (147,834) (182,150) (143,538) (195,989)  
Cumulative translation adjustments 2,471 38,835 (2,735) 55,971  
Pension and postretirement liability adjustments 262 (855) 846 (3,517)  
Derivative valuation adjustment and other 424 (122) 750 (757)  
Balance at end of the period (144,677) (144,292) (144,677) (144,292)  
Class A Treasury Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at start of the period $ (567,139) $ (448,363) $ (567,139) $ (379,210)  
Treasury stock, balance at the beginning of the period (in shares) 12,686,000 10,770,000 12,686,000 9,845,000  
Purchase of Treasury shares (in shares)   746,000   1,671,000  
Purchase of Treasury shares   $ (51,295)   $ (120,448)  
Share repurchase excise tax adjustment $ 146   $ 146    
Balance at end of the period $ (566,993) $ (499,658) $ (566,993) $ (499,658)  
Treasury stock, balance at the end of the period (in shares) 12,686,000 11,516,000 12,686,000 11,516,000  
Noncontrolling Interest          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at start of the period $ 6,014 $ 5,193 $ 5,893 $ 5,409  
Net income 290 149 458 143  
Dividends paid to noncontrolling interests       (88)  
Cumulative translation adjustments 96 67 49 (55)  
Derivative valuation adjustment and other   88   88  
Balance at end of the period $ 6,400 $ 5,497 $ 6,400 $ 5,497