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Condensed Consolidated Statements Of Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Capital Surplus [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
 [1]
Retained Earnings [Member]
Treasury Stock [Member]
Noncontrolling Interests [Member]
Balance at Dec. 31, 2016 $ 1,537,942 $ 606 $ 52,219 $ (101,703) $ 1,596,269 $ (10,302) $ 853
Net income including noncontrolling interests 109,398       109,398   0
Other comprehensive income 543     543      
Common stock issued under share-based compensation plans 1 2 (1)        
Tax withholding for common stock issued under share-based compensation plans (3,354)   (3,354)        
Common stock issued under employee stock purchase plan 2,191   2,191        
Common stock dividends (9,531)       (9,615)    
Common stock dividends, accrued dividend shares     84        
Repurchase of common stock (63,430) (10) (55,646)   (7,774)    
Share-based compensation expense 5,169   5,169        
Balance at Jun. 30, 2017 1,578,929 598 662 (101,160) 1,688,278 (10,302) 853
Balance at Dec. 31, 2017 1,674,117 599 8,005 (94,200) 1,796,556 (37,693) 850
Net income including noncontrolling interests 126,190       126,190   0
Other comprehensive income 600     600      
Cumulative-effect adjustment [2] (854)       (854)    
Common stock issued under share-based compensation plans 0 1 (1)        
Tax withholding for common stock issued under share-based compensation plans (3,745)   (3,745)        
Common stock issued under employee stock purchase plan 2,758   2,758        
Common stock dividends (9,381)       (9,462)    
Common stock dividends, accrued dividend shares     81        
Repurchase of common stock [3] (60,508)         (60,508)  
Share-based compensation expense 5,956   5,956        
Balance at Jun. 30, 2018 $ 1,735,133 $ 600 $ 13,054 $ (93,600) $ 1,912,430 $ (98,201) $ 850
[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 606.
[3] Beginning June 1, 2017, shares of common stock repurchased are held as treasury stock by the Company.