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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 (Loss) [Member]
Beginning balance at Dec. 31, 2018 $ 1,851,190 $ 1,293,669 $ 575,805 $ (18,284)
Beginning balance, shares at Dec. 31, 2018   140,000    
Repurchase of common stock (812) $ (812)    
Repurchase of common stock, shares   (36)    
Exercise of stock options 2,057 $ 2,057    
Exercise of stock options, shares   145    
Shares issued pursuant to stock-based compensation plan 1,971 $ 1,971    
Shares issued pursuant to stock-based compensation plan, shares   33    
Cash dividends declared on common stock (50,416)   (50,416)  
Net earnings 106,123   106,123  
Other comprehensive income 26,564     26,564
Ending balance at Jun. 30, 2019 1,936,677 $ 1,296,885 631,512 8,280
Ending balance, shares at Jun. 30, 2019   140,142    
Beginning balance at Mar. 31, 2019 1,890,927 $ 1,294,093 602,279 (5,445)
Beginning balance, shares at Mar. 31, 2019   140,009    
Repurchase of common stock (77) $ (77)    
Repurchase of common stock, shares   (3)    
Exercise of stock options 1,917 $ 1,917    
Exercise of stock options, shares   136    
Shares issued pursuant to stock-based compensation plan 952 $ 952    
Cash dividends declared on common stock (25,248)   (25,248)  
Net earnings 54,481   54,481  
Other comprehensive income 13,725     13,725
Ending balance at Jun. 30, 2019 1,936,677 $ 1,296,885 631,512 8,280
Ending balance, shares at Jun. 30, 2019   140,142    
Beginning balance at Dec. 31, 2019 1,994,098 $ 1,298,792 682,692 12,614
Beginning balance, shares at Dec. 31, 2019   140,102    
Cumulative adjustment upon adoption of ASU 2016-13 at Dec. 31, 2019 (1,325)   (1,325)  
Repurchase of common stock (92,430) $ (92,430)    
Repurchase of common stock, shares   (4,989)    
Exercise of stock options 121 $ 121    
Exercise of stock options, shares   10    
Shares issued pursuant to stock-based compensation plan 2,966 $ 2,966    
Shares issued pursuant to stock-based compensation plan, shares   393    
Cash dividends declared on common stock (48,833)   (48,833)  
Net earnings 79,611   79,611  
Other comprehensive income 24,890     24,890
Ending balance at Jun. 30, 2020 1,959,098 $ 1,209,449 712,145 37,504
Ending balance, shares at Jun. 30, 2020   135,516    
Beginning balance at Mar. 31, 2020 1,941,386 $ 1,208,049 694,931 38,406
Beginning balance, shares at Mar. 31, 2020   135,511    
Repurchase of common stock (28) $ (28)    
Repurchase of common stock, shares   (1)    
Exercise of stock options 79 $ 79    
Exercise of stock options, shares   6    
Shares issued pursuant to stock-based compensation plan 1,349 $ 1,349    
Cash dividends declared on common stock (24,417)   (24,417)  
Net earnings 41,631   41,631  
Other comprehensive income (902)     (902)
Ending balance at Jun. 30, 2020 $ 1,959,098 $ 1,209,449 $ 712,145 $ 37,504
Ending balance, shares at Jun. 30, 2020   135,516