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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 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Oct. 25, 2021
Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of the period $ 868,059 $ 826,211 $ 819,865 $ 706,158 $ 669,561 $ 702,689 $ 819,865 $ 702,689      
Accounting Standards Update [Extensible Enumeration]                 Accounting Standards Update 2016-13 [Member]    
Net income 30,942 31,440 27,609 29,590 32,449 7,594 89,992 69,633      
Compensation and benefits paid or payable in shares 845 692 (13) 80 783 (682)          
Options exercised 4 21 128 5 20            
Shares issued to Directors' 0 947     416            
Cumulative translation adjustments (15,135) 13,957 (16,165) 20,022 9,116 (25,638)          
Pension and postretirement liability adjustments 223 (130) 509 (474) 142 890          
Derivative valuation adjustment 1,873 1,394 752 621 (187) (7,708)          
Balance at end of the period $ 880,333 868,059 826,211 $ 749,858 706,158 669,561 $ 880,333 $ 749,858 $ 702,689    
Dividends declared per share, Class A and Class B (in dollars per share) $ 0.20     $ 0.19     $ 0.60 $ 0.57      
Conversion price (in dollars per share) $ 75.9656           75.9656        
Subsequent Event                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Stock repurchase program, authorized amount                   $ 200,000  
Selling Stockholders And Related Persons                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Stockholders voting percentage (less than) 1.00%                    
Common Class A                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Dividends declared $ (6,478) $ (6,150) $ (6,150) $ (5,837) $ (5,835) $ (5,834)          
Dividends declared per share, Class A and Class B (in dollars per share) $ 0.20 $ 0.20 $ 0.20 $ 0.19 $ 0.20 $ 0.19          
Common stock, par or stated value per share (in dollars per share) $ 0.001           $ 0.001       $ 0.001
Common Class A | J.P. Morgan Securities, LLC                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Conversion of Class B shares to Class A shares (in shares) 1,566,644                    
Common Class A | Selling Stockholders                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Conversion of Class B shares to Class A shares (in shares) (1,566,644)                    
Common Class B                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at the beginning of the period (in shares)     1,617,998       1,617,998        
Dividends declared $ 0 $ (323) $ (324) $ (307) $ (307) $ (307)          
Balance at the end of the period (in shares) 1,154           1,154        
Dividends declared per share, Class A and Class B (in dollars per share) $ 0.20 $ 0.20 $ 0.20 $ 0.19 $ 0.20 $ 0.19          
Common stock, par or stated value per share (in dollars per share) $ 0.001           $ 0.001       $ 0.001
Cumulative Effect, Period of Adoption, Adjustment                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of the period           $ (1,443)   $ (1,443)      
Balance at end of the period                 (1,443)    
Common Stock | Common Class A                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of the period $ 39 $ 39 $ 39 $ 39 $ 39 $ 39 $ 39 $ 39      
Balance at the beginning of the period (in shares) 39,142,000 39,141,000 39,115,000 39,113,000 39,112,000 39,099,000 39,115,000 39,099,000      
Compensation and benefits paid or payable in shares (in shares)     20,000     13,000          
Options exercised (in shares) 1,000 1,000 6,000 1,000 1,000            
Conversion of Class B shares to Class A shares (in shares) 1,617,000                    
Conversion of Class B shares to Class A shares $ 2                    
Balance at end of the period $ 41 $ 39 $ 39 $ 39 $ 39 $ 39 $ 41 $ 39 $ 39    
Balance at the end of the period (in shares) 40,760,000 39,142,000 39,141,000 39,114,000 39,113,000 39,112,000 40,760,000 39,114,000 39,099,000    
Common Stock | Common Class B                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of the period $ 2 $ 2 $ 2 $ 2 $ 2 $ 2 $ 2 $ 2      
Balance at the beginning of the period (in shares) 1,618,000 1,618,000 1,618,000 1,618,000 1,618,000 1,618,000 1,618,000 1,618,000      
Conversion of Class B shares to Class A shares (in shares) (1,617,000)                    
Conversion of Class B shares to Class A shares $ (2)                    
Balance at end of the period $ 0 $ 2 $ 2 $ 2 $ 2 $ 2 $ 0 $ 2 $ 2    
Balance at the end of the period (in shares) 1,000 1,618,000 1,618,000 1,618,000 1,618,000 1,618,000 1,000 1,618,000 1,618,000    
Additional paid-in capital                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of the period $ 435,230 $ 433,811 $ 433,696 $ 432,738 $ 431,836 $ 432,518 $ 433,696 $ 432,518      
Compensation and benefits paid or payable in shares 845 692 (13) 80 466 (682)          
Options exercised 4 21 128 5 20            
Shares issued to Directors' 0 706     416            
Balance at end of the period 436,079 435,230 433,811 432,823 432,738 431,836 436,079 432,823 $ 432,518    
Retained earnings                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of the period 816,778 791,854 770,746 726,233 700,021 698,496 770,746 698,496      
Net income 30,862 31,397 27,582 29,589 32,354 9,109          
Balance at end of the period 841,162 816,778 791,854 749,678 726,233 700,021 841,162 749,678 698,496    
Retained earnings | Common Class A                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Dividends declared (6,478) (6,150) (6,150) (5,837) (5,835) (5,834)          
Retained earnings | Common Class B                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Dividends declared 0 (323) (324) (307) (307) (307)          
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of the period           (1,443)   (1,443)      
Balance at end of the period                 (1,443)    
Accumulated other comprehensive income                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of the period (132,064) (147,102) (132,408) (199,627) (208,546) (175,981) (132,408) (175,981)      
Cumulative translation adjustments (14,943) 13,774 (15,955) 19,821 8,964 (25,747)          
Pension and postretirement liability adjustments 223 (130) 509 (474) 142 890          
Derivative valuation adjustment 1,873 1,394 752 621 (187) (7,708)          
Balance at end of the period (144,911) (132,064) (147,102) (179,659) (199,627) (208,546) (144,911) (179,659) (175,981)    
Treasury Stock                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of the period $ (255,768) $ (256,009) $ (256,009) $ (256,074) $ (256,391) $ (256,391) $ (256,009) $ (256,391)      
Balance at the beginning of the period (in shares) (8,380,000) (8,391,000) (8,391,000) (8,394,000) (8,409,000) (8,409,000) (8,391,000) (8,409,000)      
Compensation and benefits paid or payable in shares (in shares)         15,000            
Compensation and benefits paid or payable in shares         $ 317            
Shares issued to Directors' (in shares) 0 (11,000)                  
Shares issued to Directors' $ 0 $ 241                  
Balance at end of the period $ (255,768) $ (255,768) $ (256,009) $ (256,074) $ (256,074) $ (256,391) $ (255,768) $ (256,074) $ (256,391)    
Balance at the end of the period (in shares) (8,380,000) (8,380,000) (8,391,000) (8,394,000) (8,394,000) (8,409,000) (8,380,000) (8,394,000) (8,409,000)    
Noncontrolling Interest                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of the period $ 3,842 $ 3,616 $ 3,799 $ 2,847 $ 2,600 $ 4,006 $ 3,799 $ 4,006      
Net income 80 43 27 1 95 (1,515)          
Cumulative translation adjustments (192) 183 (210) 201 152 109          
Balance at end of the period $ 3,730 $ 3,842 $ 3,616 $ 3,049 $ 2,847 $ 2,600 $ 3,730 $ 3,049 $ 4,006