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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, 2019 $ 2,057,780 $ 604 $ 32,274 $ (89,288) $ 2,367,481 $ (253,937) $ 646
Net income (loss) including noncontrolling interests (8,024)       (8,024)    
Other comprehensive income (loss) (1,884)     (1,884)      
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 (2,550)   (2,550)        
Common stock issued under employee stock purchase plan 3,228   3,228        
Common stock dividends (8,888)       (8,951)    
Common stock dividends, accrued dividend shares     63        
Repurchases of common stock (99,048)         (99,048)  
Distributions to noncontrolling interests (70)           (70)
Share-based compensation expense 5,960   5,960        
Balance at Jun. 30, 2020 1,944,198 605 38,975 (91,172) 2,348,199 (352,985) 576
Balance at Mar. 31, 2020 2,027,594 605 34,745 (91,722) 2,436,305 (352,985) 646
Net income (loss) including noncontrolling interests (83,689)       (83,689)    
Other comprehensive income (loss) 550     550      
Tax withholding for common stock issued under share-based compensation plans (58)   (58)        
Common stock issued under employee stock purchase plan 1,590   1,590        
Common stock dividends (4,388)       (4,417)    
Common stock dividends, accrued dividend shares     29        
Distributions to noncontrolling interests (70)           (70)
Share-based compensation expense 2,669   2,669        
Balance at Jun. 30, 2020 1,944,198 605 38,975 (91,172) 2,348,199 (352,985) 576
Balance at Dec. 31, 2020 2,053,244 606 47,464 (109,233) 2,480,321 (366,490) 576
Net income (loss) including noncontrolling interests 182,293       182,124   169
Other comprehensive income (loss) 2,308     2,308      
Common stock issued under share-based compensation plans 1 1          
Tax withholding for common stock issued under share-based compensation plans (3,771)   (3,771)        
Common stock issued under employee stock purchase plan 3,561   3,561        
Common stock dividends (14,236)       (14,336)    
Common stock dividends, accrued dividend shares     100        
Repurchases of common stock (138,030)         (138,030)  
Distributions to noncontrolling interests (43)           (43)
Share-based compensation expense 5,850   5,850        
Balance at Jun. 30, 2021 2,091,177 607 53,204 (106,925) 2,648,109 (504,520) 702
Balance at Mar. 31, 2021 2,120,672 607 48,693 (107,844) 2,557,919 (379,407) 704
Net income (loss) including noncontrolling interests 97,348       97,350   (2)
Other comprehensive income (loss) 919     919      
Tax withholding for common stock issued under share-based compensation plans (21)   (21)        
Common stock issued under employee stock purchase plan 1,830   1,830        
Common stock dividends (7,115)       (7,160)    
Common stock dividends, accrued dividend shares     45        
Repurchases of common stock (125,113)         (125,113)  
Share-based compensation expense 2,657   2,657        
Balance at Jun. 30, 2021 $ 2,091,177 $ 607 $ 53,204 $ (106,925) $ 2,648,109 $ (504,520) $ 702
[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.