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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 (shares) at Dec. 31, 2017     125,381,591                  
Balance at Dec. 31, 2017 $ 285,757 $ 9,926 $ 1,254 $ 98,843 $ 990,652 $ 13,311 $ 9,454 $ (3,385) $ (814,809) $ 285,394 $ 9,926 $ 363
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 227,305       226,958         226,958   347
Dividends declared (64,159)       (64,159)         (64,159)    
Currency translation adjustments (9,642)           (9,642)     (9,642)    
Derivative financial instruments 332           332     332    
Defined benefit obligations (6,944)           (6,944)     (6,944)    
Available-for-sale investments (104)           (104)     (104)    
Exercise of stock options (shares)     210,311                  
Exercises of stock options 5,004   $ 2 5,002           5,004    
Shares placed in treasury (222,986)               (222,986) (222,986)    
Stock-based compensation charges (shares)     279,964                  
Stock-based compensation charges 11,883   $ 3 11,880           11,883    
Distributions to noncontrolling interests (671)                     (671)
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
Balance (shares) at Dec. 31, 2018     125,871,866                  
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    
Exercise of stock options (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 (shares)     460,452                  
Stock-based compensation charges 12,726   $ 5 12,721           12,726    
Distributions to noncontrolling interests (595)                     (595)
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
Balance (shares) at Dec. 31, 2019 126,579,285   126,579,285                  
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)    
Exercise of stock options (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 (shares)     334,501                  
Stock-based compensation charges 16,844   $ 3 16,841           16,844    
Distributions to noncontrolling interests (530)                     (530)
Balance at Dec. 31, 2020 $ 617,768   $ 1,270 $ 153,800 $ 1,549,950   $ 8,198   $ (1,095,452) $ 617,766   $ 2
Balance (shares) at Dec. 31, 2020 127,009,536   127,009,536