v3.25.1
Changes in Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Feb. 21, 2025
Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at start of the period $ 948,947,000 $ 967,320,000    
Net income 17,349,000 27,369,000    
Compensation and benefits paid or payable in shares 2,651,000 810,000    
Purchase of Treasury shares (a) (69,153,000)      
Dividends paid to noncontrolling interests (88,000)      
Cumulative translation adjustments 17,014,000 (12,070,000)    
Pension and postretirement liability adjustments (2,662,000) 382,000    
Derivative valuation adjustment and other (628,000) (2,124,000)    
Balance at end of the period $ 905,168,000 $ 973,565,000    
Dividends declared on Class A Common Stock (in dollars per share) $ 0.27 $ 0.26    
Stock repurchase program, authorized amount     $ 250,000,000 $ 200,000,000
Common Class A        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Treasury stock, balance at the beginning of the period (in shares) 9,844,746      
Dividends declared on Class A Common Stock $ (8,262,000) $ (8,122,000)    
Treasury stock, balance at the end of the period (in shares) 10,770,189      
Dividends declared on Class A Common Stock (in dollars per share) $ 0.27 $ 0.26    
Common Stock | Common Class A        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common stock, balance at the beginning of the period (in shares) 40,917,000 40,856,000    
Balance at start of the period $ 41,000 $ 41,000    
Compensation and benefits paid or payable in shares (in shares) 56,000 42,000    
Common stock, balance at the end of the period (in shares) 40,973,000 40,898,000    
Balance at end of the period $ 41,000 $ 41,000    
Additional paid-in capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at start of the period 452,933,000 448,218,000    
Compensation and benefits paid or payable in shares 2,651,000 810,000    
Balance at end of the period 455,584,000 449,028,000    
Retained  earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at start of the period 1,065,763,000 1,010,942,000    
Net income 17,355,000 27,291,000    
Derivative valuation adjustment and other 7,000      
Balance at end of the period 1,074,863,000 1,030,111,000    
Retained  earnings | Common Class A        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends declared on Class A Common Stock (8,262,000) (8,122,000)    
Accumulated items of other comprehensive income        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at start of the period (195,989,000) (133,168,000)    
Cumulative translation adjustments 17,136,000 (12,116,000)    
Pension and postretirement liability adjustments (2,662,000) 382,000    
Derivative valuation adjustment and other (635,000) (2,124,000)    
Balance at end of the period (182,150,000) (147,026,000)    
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at start of the period $ (379,210,000) $ (364,665,000)    
Treasury stock, balance at the beginning of the period (in shares) 9,845,000 9,662,000    
Purchase of Treasury shares (in shares) 925,443      
Purchase of Treasury shares (a) $ (69,153,000)      
Balance at end of the period $ (448,363,000) $ (364,665,000)    
Treasury stock, balance at the end of the period (in shares) 10,770,000 9,662,000    
Noncontrolling Interest        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at start of the period $ 5,409,000 $ 5,952,000    
Net income (6,000) 78,000    
Dividends paid to noncontrolling interests (88,000)      
Cumulative translation adjustments (122,000) 46,000    
Balance at end of the period $ 5,193,000 $ 6,076,000