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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Beginning balance at Dec. 31, 2013 $ 771,887 $ 491,068 $ 290,149 $ (9,330)
Beginning balance, shares at Dec. 31, 2013   105,370    
Repurchase of common stock (5,383) $ (5,383)    
Repurchase of common stock, shares   (377)    
Exercise of stock options 5,378 $ 5,378    
Exercise of stock options, shares   498    
Tax benefit from exercise of stock options 983 $ 983    
Shares issued pursuant to stock-based compensation plan 2,277 $ 2,277    
Shares issued pursuant to stock-based compensation plan, shares   306    
Cash dividends declared on common stock (31,769)   (31,769)  
Net earnings 78,440   78,440  
Other comprehensive income 27,418     27,418
Ending balance at Sep. 30, 2014 849,231 $ 494,323 336,820 18,088
Ending balance, shares at Sep. 30, 2014   105,797    
Beginning balance at Dec. 31, 2014 878,109 $ 495,220 351,814 31,075
Beginning balance, shares at Dec. 31, 2014   105,893    
Repurchase of common stock (606) $ (606)    
Repurchase of common stock, shares   (41)    
Exercise of stock options 4,672 $ 4,672    
Exercise of stock options, shares   411    
Tax benefit from exercise of stock options 772 $ 772    
Shares issued pursuant to stock-based compensation plan 2,044 $ 2,044    
Shares issued pursuant to stock-based compensation plan, shares   92    
Cash dividends declared on common stock (38,274)   (38,274)  
Net earnings 70,532   70,532  
Other comprehensive income 3,478     3,478
Ending balance at Sep. 30, 2015 $ 920,727 $ 502,102 $ 384,072 $ 34,553
Ending balance, shares at Sep. 30, 2015   106,355