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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 69,182   69,182  
Other comprehensive income 19,378     19,378
Stock options exercised 2,646 $ 2,646    
Stock options exercised (in shares)   166,000    
RSU vesting 863 $ 863    
PSU vesting 350 $ 350    
RSUs released (in shares)   30,461    
PSUs released (in shares)   22,237    
Repurchase of common stock (4,842) $ (2,206) (2,636)  
Repurchase of common stock (in shares)   (123,734)    
Dividends paid (18,285)   (18,285)  
Ending balance at Sep. 30, 2019 896,665 $ 543,415 351,751 1,499
Ending balance (in shares) at Sep. 30, 2019   30,512,187    
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    
Ending balance at Dec. 31, 2019 $ 906,570 $ 543,998 367,794 (5,222)
Ending balance (in shares) at Dec. 31, 2019 30,523,824 30,523,824    
Beginning balance at Jun. 30, 2019 $ 875,886 $ 542,939 335,145 (2,198)
Beginning balance (in shares) at Jun. 30, 2019   30,502,757    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 23,395   23,395  
Other comprehensive income 3,697     3,697
Stock options exercised 146 $ 146    
Stock options exercised (in shares)   9,000    
RSU vesting 296 $ 296    
PSU vesting 102 $ 102    
RSUs released (in shares)   4,250    
Repurchase of common stock (147) $ (68) (79)  
Repurchase of common stock (in shares)   (3,820)    
Dividends paid (6,710)   (6,710)  
Ending balance at Sep. 30, 2019 896,665 $ 543,415 351,751 1,499
Ending balance (in shares) at Sep. 30, 2019   30,512,187    
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 $ 41,157   41,157  
Other comprehensive income 10,798     10,798
Stock options exercised $ 547 $ 547    
Stock options exercised (in shares) 32,000 32,000    
RSU vesting $ 1,018 $ 1,018    
PSU vesting 458 $ 458    
RSUs released (in shares)   31,708    
PSUs released (in shares)   20,265    
Repurchase of common stock (25,545) $ (14,946) (10,599)  
Repurchase of common stock (in shares)   (838,408)    
Dividends paid (19,758)   (19,758)  
Ending balance at Sep. 30, 2020 $ 902,262 $ 531,075 365,611 5,576
Ending balance (in shares) at Sep. 30, 2020 29,769,389 29,769,389    
Beginning balance at Jun. 30, 2020 $ 885,686 $ 530,422 354,645 619
Beginning balance (in shares) at Jun. 30, 2020   29,759,209    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 17,606   17,606  
Other comprehensive income 4,957     4,957
Stock options exercised 259 $ 259    
Stock options exercised (in shares)   16,000    
RSU vesting 383 $ 383    
PSU vesting 162 $ 162    
RSUs released (in shares)   2,619    
Repurchase of common stock (242) $ (151) (91)  
Repurchase of common stock (in shares)   (8,439)    
Dividends paid (6,549)   (6,549)  
Ending balance at Sep. 30, 2020 $ 902,262 $ 531,075 $ 365,611 $ 5,576
Ending balance (in shares) at Sep. 30, 2020 29,769,389 29,769,389