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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Capital In Excess of Par Value
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock
Stockholders' Equity
Stockholders' Equity
Cumulative Effect, Period of Adoption, Adjustment
Noncontrolling Interest
Balance (in shares) at Dec. 31, 2018     125,871,866                  
Balance at Dec. 31, 2018 $ 235,701 $ (1,142) $ 1,259 $ 115,725 $ 1,166,762 $ (1,219) $ (10,289) $ 77 $ (1,037,795) $ 235,662 $ (1,142) $ 39
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 244,677       244,115         244,115   562
Dividends declared (65,275)       (65,275)         (65,275)    
Currency translation adjustments 5,263           5,263     5,263    
Derivative financial instruments (698)           (698)     (698)    
Defined benefit obligations (2,219)           (2,219)     (2,219)    
Available-for-sale investments 418           418     418    
Exercises of stock options (in shares)     246,967                  
Exercises of stock options 5,625   $ 2 5,623           5,625    
Shares placed in treasury (30,369)               (30,369) (30,369)    
Stock-based compensation charges (in shares)     460,452                  
Stock-based compensation charges 12,726   $ 5 12,721           12,726    
Distributions to noncontrolling interests (595)                     (595)
Balance (in shares) at Dec. 31, 2019     126,579,285                  
Balance at Dec. 31, 2019 404,112 0 $ 1,266 134,069 1,344,383 0 (7,448) 0 (1,068,164) 404,106 0 6
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 279,196       278,670         278,670   526
Dividends declared (73,103)       (73,103)         (73,103)    
Currency translation adjustments 15,685           15,685     15,685    
Derivative financial instruments (560)           (560)     (560)    
Defined benefit obligations 712           712     712    
Available-for-sale investments (191)           (191)     (191)    
Exercises of stock options (in shares)     95,750                  
Exercises of stock options 2,891   $ 1 2,890           2,891    
Shares placed in treasury (27,288)               (27,288) (27,288)    
Stock-based compensation charges (in shares)     334,501                  
Stock-based compensation charges 16,844   $ 3 16,841           16,844    
Distributions to noncontrolling interests $ (530)                     (530)
Balance (in shares) at Dec. 31, 2020 127,009,536   127,009,536                  
Balance at Dec. 31, 2020 $ 617,768 $ 0 $ 1,270 153,800 1,549,950 $ 0 8,198 $ 0 (1,095,452) 617,766 $ 0 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 306,288       305,871         305,871   417
Dividends declared (80,070)       (80,070)         (80,070)    
Currency translation adjustments 6,173           6,173     6,173    
Derivative financial instruments (198)           (198)     (198)    
Defined benefit obligations (2,120)           (2,120)     (2,120)    
Available-for-sale investments 90           90     90    
Exercises of stock options (in shares)     76,682                  
Exercises of stock options 1,878   $ 0 1,878           1,878    
Shares placed in treasury (230,828)               (230,828) (230,828)    
Stock-based compensation charges (in shares)     225,767                  
Stock-based compensation charges 18,613   $ 3 18,610           18,613    
Distributions to noncontrolling interests $ (359)                     (359)
Balance (in shares) at Dec. 31, 2021 127,311,985   127,311,985                  
Balance at Dec. 31, 2021 $ 637,235   $ 1,273 $ 174,288 $ 1,775,751   $ 12,143   $ (1,326,280) $ 637,175   $ 60