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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 [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 (792) $ (792)    
Repurchase of common stock, shares   (34)    
Exercise of stock options 828 $ 828    
Exercise of stock options, shares   87    
Shares issued pursuant to stock-based compensation plan 736 $ 736    
Shares issued pursuant to stock-based compensation plan, shares   21    
Cash dividends declared on common stock (15,434)   (15,434)  
Net earnings 34,913   34,913  
Other comprehensive income (22,659)     (22,659)
Ending balance at Mar. 31, 2018 1,066,858 $ 574,225 513,484 (20,851)
Ending balance, shares at Mar. 31, 2018   110,259    
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 (735) $ (735)    
Repurchase of common stock, shares   (33)    
Exercise of stock options 140 $ 140    
Exercise of stock options, shares   9    
Shares issued pursuant to stock-based compensation plan 1,019 $ 1,019    
Shares issued pursuant to stock-based compensation plan, shares   33    
Cash dividends declared on common stock (25,168)   (25,168)  
Net earnings 51,642   51,642  
Other comprehensive income 12,839     12,839
Ending balance at Mar. 31, 2019 $ 1,890,927 $ 1,294,093 $ 602,279 $ (5,445)
Ending balance, shares at Mar. 31, 2019   140,009