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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, 2017 $ 1,069,266 $ 573,453 $ 494,361 $ 1,452
Beginning balance, shares at Dec. 31, 2017   110,185    
Cumulative adjustment upon adoption of ASU 2018-02     (356) 356
Repurchase of common stock (837) $ (837)    
Repurchase of common stock, shares   (36)    
Exercise of stock options 1,417 $ 1,417    
Exercise of stock options, shares   138    
Shares issued pursuant to stock-based compensation plan 1,469 $ 1,469    
Shares issued pursuant to stock-based compensation plan, shares   15    
Cash dividends declared on common stock (30,878)   (30,878)  
Net earnings 70,286   70,286  
Other comprehensive income/loss (27,306)     (27,306)
Ending balance at Jun. 30, 2018 1,083,417 $ 575,502 533,413 (25,498)
Ending balance, shares at Jun. 30, 2018   110,302    
Beginning balance at Mar. 31, 2018 1,066,858 $ 574,225 513,484 (20,851)
Beginning balance, shares at Mar. 31, 2018   110,259    
Repurchase of common stock (45) $ (45)    
Repurchase of common stock, shares   (2)    
Exercise of stock options 589 $ 589    
Exercise of stock options, shares   51    
Shares issued pursuant to stock-based compensation plan 733 $ 733    
Shares issued pursuant to stock-based compensation plan, shares   (6)    
Cash dividends declared on common stock (15,444)   (15,444)  
Net earnings 35,373   35,373  
Other comprehensive income/loss (4,647)     (4,647)
Ending balance at Jun. 30, 2018 1,083,417 $ 575,502 533,413 (25,498)
Ending balance, shares at Jun. 30, 2018   110,302    
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/loss 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    
Shares issued pursuant to stock-based compensation plan, shares   0    
Cash dividends declared on common stock (25,248)   (25,248)  
Net earnings 54,481   54,481  
Other comprehensive income/loss 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