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Condensed Consolidated Statements Of Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Capital Surplus [Member]
Accumulated Other Comprehensive Loss [Member]
 [1]
Retained Earnings [Member]
Treasury Stock [Member]
Noncontrolling Interests [Member]
Balance at Dec. 31, 2018 $ 1,741,441 $ 601 $ 21,103 $ (87,662) $ 2,060,440 $ (253,937) $ 896
Net income 238,216       238,216    
Other comprehensive income (loss) 292     292      
Common stock issued under share-based compensation plans 0 2 (2)        
Tax withholding for common stock issued under share-based compensation plans (3,771)   (3,771)        
Common stock issued under employee stock purchase plan 4,501   4,501        
Common stock dividends (13,458)       (13,573)    
Common stock dividends, accrued dividend shares     115        
Distributions to noncontrolling interests (250)           (250)
Share-based compensation expense 8,840   8,840        
Balance at Sep. 30, 2019 1,975,811 603 30,786 (87,370) 2,285,083 (253,937) 646
Balance at Jun. 30, 2019 1,894,831 603 26,640 (86,896) 2,207,775 (253,937) 646
Net income 81,834       81,834    
Other comprehensive income (loss) (474)     (474)      
Tax withholding for common stock issued under share-based compensation plans (36)   (36)        
Common stock issued under employee stock purchase plan 1,532   1,532        
Common stock dividends (4,491)       (4,526)    
Common stock dividends, accrued dividend shares     35        
Share-based compensation expense 2,615   2,615        
Balance at Sep. 30, 2019 1,975,811 603 30,786 (87,370) 2,285,083 (253,937) 646
Balance at Dec. 31, 2019 2,057,780 604 32,274 (89,288) 2,367,481 (253,937) 646
Net income 53,162       53,162    
Other comprehensive income (loss) 804     804      
Cumulative-effect adjustment (2) [2] (2,307)       (2,307)    
Common stock issued under share-based compensation plans 1 1          
Tax withholding for common stock issued under share-based compensation plans (2,574)   (2,574)        
Common stock issued under employee stock purchase plan 4,887   4,887        
Common stock dividends (13,280)       (13,372)    
Common stock dividends, accrued dividend shares     92        
Repurchase of common stock (99,048)         (99,048)  
Distributions to noncontrolling interests (70)           (70)
Share-based compensation expense 8,510   8,510        
Balance at Sep. 30, 2020 2,007,865 605 43,189 (88,484) 2,404,964 (352,985) 576
Balance at Jun. 30, 2020 1,944,198 605 38,975 (91,172) 2,348,199 (352,985) 576
Net income 61,186       61,186    
Other comprehensive income (loss) 2,688     2,688      
Tax withholding for common stock issued under share-based compensation plans (24)   (24)        
Common stock issued under employee stock purchase plan 1,659   1,659        
Common stock dividends (4,392)       (4,421)    
Common stock dividends, accrued dividend shares     29        
Share-based compensation expense 2,550   2,550        
Balance at Sep. 30, 2020 $ 2,007,865 $ 605 $ 43,189 $ (88,484) $ 2,404,964 $ (352,985) $ 576
[1] Represents cumulative foreign currency translation adjustments and post retirement liability adjustments.
[2] Represents adjustment to retained earnings upon the adoption of Accounting Standards Codification Topic 326.