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Consolidated Statements Of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2013 $ 1,772,697 $ 2,968 $ 69,847 $ 1,688,781 $ 11,101
Balance (in shares) at Dec. 31, 2013   296,753,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Dividends paid in cash (296,581)     (296,581)  
Purchases of common stock (52,942) $ (12) (52,930) 0  
Purchases of common stock (in shares)   (1,200,000)      
Stock options exercised 7,697 $ 3 7,694    
Stock options exercised (in shares)   315,000      
Stock-based compensation 7,039   7,039    
Excess tax benefits from stock-based compensation 2,094   2,094    
Net earnings 494,150     494,150  
Other comprehensive income (loss) (18,937)       (18,937)
Balance at Dec. 31, 2014 1,915,217 $ 2,959 33,744 1,886,350 (7,836)
Balance (in shares) at Dec. 31, 2014   295,868,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Dividends paid in cash (327,101)     (327,101)  
Purchases of common stock (292,951) $ (71) (60,042) (232,838)  
Purchases of common stock (in shares)   (7,100,000)      
Stock options exercised 19,099 $ 8 19,091    
Stock options exercised (in shares)   814,000      
Stock-based compensation 5,841   5,841    
Excess tax benefits from stock-based compensation 3,390   3,390    
Net earnings 516,361     516,361  
Other comprehensive income (loss) (38,567)       (38,567)
Balance at Dec. 31, 2015 $ 1,801,289 $ 2,896 2,024 1,842,772 (46,403)
Balance (in shares) at Dec. 31, 2015 289,581,682 289,582,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Dividends paid in cash $ (346,588)     (346,588)  
Purchases of common stock (59,440) $ (16) (3,905) (55,519)  
Purchases of common stock (in shares)   (1,600,000)      
Stock options exercised 29,272 $ 12 29,260    
Stock options exercised (in shares)   1,180,000      
Stock-based compensation 4,100   4,100    
Excess tax benefits from stock-based compensation 5,884   5,884    
Net earnings 499,478     499,478  
Other comprehensive income (loss) (901)       (901)
Balance at Dec. 31, 2016 $ 1,933,094 $ 2,892 $ 37,363 $ 1,940,143 $ (47,304)
Balance (in shares) at Dec. 31, 2016 289,161,924 289,162,000