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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [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 (559) $ (559)    
Repurchase of common stock, shares   (42)    
Exercise of stock options 4,517 $ 4,517    
Exercise of stock options, shares   428    
Tax benefit from exercise of stock options 475 $ 475    
Shares issued pursuant to stock-based compensation plan 1,926 $ 1,926    
Shares issued pursuant to stock-based compensation plan, shares   94    
Cash dividends declared on common stock (40,469)   (40,469)  
Net earnings 95,608   95,608  
Other comprehensive income (loss) (52,581)     (52,581)
Ending balance at Dec. 31, 2013 771,887 $ 491,068 290,149 (9,330)
Ending balance, shares at Dec. 31, 2013   105,370    
Repurchase of common stock (5,474) $ (5,474)    
Repurchase of common stock, shares   (384)    
Exercise of stock options 5,522 $ 5,522    
Exercise of stock options, shares   512    
Tax benefit from exercise of stock options 1,116 $ 1,116    
Shares issued pursuant to stock-based compensation plan 2,988 $ 2,988    
Shares issued pursuant to stock-based compensation plan, shares   395    
Cash dividends declared on common stock (42,356)   (42,356)  
Net earnings 104,021   104,021  
Other comprehensive income (loss) 40,405     40,405
Ending balance at Dec. 31, 2014 878,109 $ 495,220 351,814 31,075
Ending balance, shares at Dec. 31, 2014   105,893    
Repurchase of common stock (834) $ (834)    
Repurchase of common stock, shares   (54)    
Exercise of stock options $ 5,144 $ 5,144    
Exercise of stock options, shares 449 449    
Tax benefit from exercise of stock options $ 308 $ 308    
Shares issued pursuant to stock-based compensation plan 2,733 $ 2,733    
Shares issued pursuant to stock-based compensation plan, shares   97    
Cash dividends declared on common stock (51,040)   (51,040)  
Net earnings 99,145   99,145  
Other comprehensive income (loss) (10,166)     (10,166)
Ending balance at Dec. 31, 2015 $ 923,399 $ 502,571 $ 399,919 $ 20,909
Ending balance, shares at Dec. 31, 2015   106,385