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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 (24) (24)    
Repurchase of common stock, shares   (2)    
Exercise of stock options 95 95    
Exercise of stock options, shares   10    
Tax benefit from exercise of stock options 5 5    
Shares issued pursuant to stock-based compensation plan 461 461    
Shares issued pursuant to stock-based compensation plan, shares   5    
Cash dividends declared (8,912)   (8,912)  
Net earnings 21,615   21,615  
Other comprehensive income (7,998)     (7,998)
Ending balance at Mar. 31, 2013 768,212 485,246 247,713 35,253
Ending balance, shares at Mar. 31, 2013   104,903    
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 (32) (32)    
Repurchase of common stock, shares   (2)    
Exercise of stock options 3,684 3,684    
Exercise of stock options, shares   334    
Tax benefit from exercise of stock options 559 559    
Shares issued pursuant to stock-based compensation plan 656 656    
Shares issued pursuant to stock-based compensation plan, shares   310    
Cash dividends declared (10,608)   (10,608)  
Net earnings 28,661   28,661  
Other comprehensive income 14,374     14,374
Ending balance at Mar. 31, 2014 $ 809,181 $ 495,935 $ 308,202 $ 5,044
Ending balance, shares at Mar. 31, 2014   106,012