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Condensed Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Beginning balance at Dec. 31, 2012 $ 762,970 $ 484,709 $ 235,010 $ 43,251
Beginning balance, shares at Dec. 31, 2012   104,890    
Repurchase of common stock (459) (459)    
Repurchase of common stock, shares   (36)    
Exercise of stock options 2,651 2,651    
Exercise of stock options, shares   259    
Tax benefit from exercise of stock options 215 215    
Shares issued pursuant to stock-based compensation plan 1,439 1,439    
Shares issued pursuant to stock-based compensation plan, shares   97    
Cash dividends declared (29,925)   (29,925)  
Net earnings 70,320   70,320  
Other comprehensive income (loss), net of tax (38,989)     (38,989)
Ending balance at Sep. 30, 2013 768,222 488,555 275,405 4,262
Ending balance, shares at Sep. 30, 2013   105,210    
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 (31,769)   (31,769)  
Net earnings 78,440   78,440  
Other comprehensive income (loss), net of tax 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