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Condensed Consolidated Statements of Changes In Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2018 $ 827,373 $ 541,762 $ 303,490 $ (17,879)
Beginning balance (in shares) at Dec. 31, 2018   30,417,223    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 45,787   45,787  
Other comprehensive income 15,681     15,681
Stock options exercised 2,500 $ 2,500    
Stock options exercised (in shares)   157,000    
RSU vesting 567 $ 567    
PSU vesting 248 $ 248    
RSUs released (in shares)   26,211    
PSUs released (in shares)   22,237    
Repurchase of common stock (4,695) $ (2,138) (2,557)  
Repurchase of common stock (in shares)   (119,914)    
Dividends paid (11,575)   (11,575)  
Ending balance at Jun. 30, 2019 875,886 $ 542,939 335,145 (2,198)
Ending balance (in shares) at Jun. 30, 2019   30,502,757    
Beginning balance at Mar. 31, 2019 853,278 $ 542,340 319,865 (8,927)
Beginning balance (in shares) at Mar. 31, 2019   30,432,419    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 23,061   23,061  
Other comprehensive income 6,729     6,729
Stock options exercised 1,853 $ 1,853    
Stock options exercised (in shares)   116,000    
RSU vesting 289 $ 289    
PSU vesting 129 $ 129    
RSUs released (in shares)   25,856    
PSUs released (in shares)   22,237    
Repurchase of common stock (3,660) $ (1,672) (1,988)  
Repurchase of common stock (in shares)   (93,755)    
Dividends paid (5,793)   (5,793)  
Ending balance at Jun. 30, 2019 875,886 $ 542,939 335,145 (2,198)
Ending balance (in shares) at Jun. 30, 2019   30,502,757    
Beginning balance at Dec. 31, 2019 $ 906,570 $ 543,998 367,794 (5,222)
Beginning balance (in shares) at Dec. 31, 2019 30,523,824 30,523,824    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income $ 23,551   23,551  
Other comprehensive income 5,841     5,841
Stock options exercised $ 288 $ 288    
Stock options exercised (in shares) 16,000 16,000    
RSU vesting $ 635 $ 635    
PSU vesting 296 $ 296    
RSUs released (in shares)   29,089    
PSUs released (in shares)   20,265    
Repurchase of common stock (25,304) $ (14,795) (10,509)  
Repurchase of common stock (in shares)   (829,969)    
Dividends paid (13,208)   (13,208)  
Ending balance at Jun. 30, 2020 $ 885,686 $ 530,422 354,645 619
Ending balance (in shares) at Jun. 30, 2020 29,759,209 29,759,209    
Beginning balance at Mar. 31, 2020 $ 866,426 $ 534,623 356,935 (25,132)
Beginning balance (in shares) at Mar. 31, 2020   29,973,516    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 7,430   7,430  
Other comprehensive income 25,751     25,751
Stock options exercised 140 $ 140    
Stock options exercised (in shares)   8,000    
RSU vesting 338 $ 338    
PSU vesting 154 $ 154    
RSUs released (in shares)   28,727    
PSUs released (in shares)   20,265    
Repurchase of common stock (8,009) $ (4,833) (3,176)  
Repurchase of common stock (in shares)   (271,299)    
Dividends paid (6,544)   (6,544)  
Ending balance at Jun. 30, 2020 $ 885,686 $ 530,422 $ 354,645 $ 619
Ending balance (in shares) at Jun. 30, 2020 29,759,209 29,759,209