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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common stock
Retained earnings
Accumulated other comprehensive income (loss), net
Beginning balance, shares at Dec. 31, 2018   36,874    
Beginning balance at Dec. 31, 2018 $ 760,723 $ 591,806 $ 176,372 $ (7,455)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock awards forfeited, shares   63    
Restricted stock units vested, net of forfeitures of restricted stock awards 0      
Exercise of stock options, shares   4    
Exercise of stock options 44 $ 44    
Stock-based compensation expense 2,366 $ 2,366    
Common stock repurchased, shares   (323)    
Common stock repurchased (8,635) $ (8,635)    
Net income 50,431   50,431  
Other comprehensive income (loss), net of tax 19,980     19,980
Cash dividends declared on common stock (20,383)   (20,383)  
Ending balance, shares at Sep. 30, 2019   36,618    
Ending balance at Sep. 30, 2019 $ 804,127 $ 585,581 206,021 12,525
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Cash dividends declared on common stock (in usd per share) $ 0.55      
Beginning balance, shares at Jun. 30, 2019   36,883    
Beginning balance at Jun. 30, 2019 $ 796,625 $ 591,703 195,168 9,754
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock awards forfeited, shares   1    
Restricted stock units vested, net of forfeitures of restricted stock awards 0      
Exercise of stock options, shares   1    
Exercise of stock options 2 $ 2    
Stock-based compensation expense 830 $ 830    
Common stock repurchased, shares   (267)    
Common stock repurchased (6,954) $ (6,954)    
Net income 17,895   17,895  
Other comprehensive income (loss), net of tax 2,771     2,771
Cash dividends declared on common stock (7,042)   (7,042)  
Ending balance, shares at Sep. 30, 2019   36,618    
Ending balance at Sep. 30, 2019 $ 804,127 $ 585,581 206,021 12,525
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Cash dividends declared on common stock (in usd per share) $ 0.19      
Beginning balance, shares at Dec. 31, 2019   36,619    
Beginning balance at Dec. 31, 2019 $ 809,311 $ 586,459 212,474 10,378
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock awards forfeited, shares   108    
Exercise of stock options, shares   8    
Exercise of stock options 122 $ 122    
Stock-based compensation expense 2,694 $ 2,694    
Common stock repurchased, shares   (825)    
Common stock repurchased (19,105) $ (19,105)    
Net income 22,688   22,688  
Other comprehensive income (loss), net of tax 14,830     14,830
Cash dividends declared on common stock (21,796)   (21,796)  
Ending balance, shares at Sep. 30, 2020   35,910    
Ending balance at Sep. 30, 2020 $ 803,129 $ 570,170 207,751 25,208
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Cash dividends declared on common stock (in usd per share) $ 0.60      
Beginning balance, shares at Jun. 30, 2020   35,909    
Beginning balance at Jun. 30, 2020 $ 793,652 $ 569,329 198,342 25,981
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock awards forfeited, shares   2    
Stock-based compensation expense 848 $ 848    
Common stock repurchased, shares   (1)    
Common stock repurchased (7) $ (7)    
Net income 16,636   16,636  
Other comprehensive income (loss), net of tax (773)     (773)
Cash dividends declared on common stock (7,227)   (7,227)  
Ending balance, shares at Sep. 30, 2020   35,910    
Ending balance at Sep. 30, 2020 $ 803,129 $ 570,170 $ 207,751 $ 25,208
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Cash dividends declared on common stock (in usd per share) $ 0.20