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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 52,610       52,640   (30)
Other comprehensive income 495     495      
Common stock issued under share-based compensation plans 0 1 (1)        
Tax withholding for common stock issued under share-based compensation plans (2,637)   (2,637)        
Common stock issued under employee stock purchase plan 864   864        
Common stock dividends (4,793)       (4,839)    
Common stock dividends, accrued dividend shares     46        
Repurchase of common stock (53,307) (8) (53,299)        
Share-based compensation expense 2,967   2,967        
Balance at Mar. 31, 2017 1,534,141 599 159 (101,208) 1,644,070 (10,302) 823
Balance at Dec. 31, 2017 1,674,117 599 8,005 (94,200) 1,796,556 (37,693) 850
Net income including noncontrolling interests 55,374       55,374   0
Other comprehensive income 880     880      
Cumulative-effect adjustment (2) [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 (3,267)   (3,267)        
Common stock issued under employee stock purchase plan 1,337   1,337        
Common stock dividends (4,704)       (4,748)    
Common stock dividends, accrued dividend shares     44        
Repurchase of common stock (34,485) 0 0     (34,485)  
Share-based compensation expense 3,268   3,268        
Balance at Mar. 31, 2018 $ 1,691,666 $ 600 $ 9,386 $ (93,320) $ 1,846,328 $ (72,178) $ 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.