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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Beginning Balances, value at Dec. 31, 2017 $ 1,339,138 $ 4,914 $ 634,192 $ 708,181 $ (8,149)
Balances, shares at Dec. 31, 2017   49,143      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense 10,089   10,089    
Shares repurchased and retired, value (211,858) $ (823) (91,520) (119,515)  
Shares repurchased and retired, shares   (8,236)      
Stock options exercised, value $ 3,631 $ 20 3,611    
Stock options exercised, shares 200 200      
Vesting of restricted stock units, value   $ 31 (31)    
Vesting of restricted stock units, shares   306      
Shares withheld for taxes, value $ (1,408) $ (6) (1,402)    
Shares withheld for taxes, shares   (56)      
Dividends declared (27,209)     (27,209)  
Net income 22,817     22,817  
Other comprehensive income (loss) (2,975)       (2,975)
Ending Balances, value at Dec. 31, 2018 1,132,225 $ 4,136 554,939 584,274 (11,124)
Balances, shares at Dec. 31, 2018   41,357      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense 10,194   10,194    
Shares repurchased and retired, value (122,110) $ (472) (52,436) (69,202)  
Shares repurchased and retired, shares   (4,719)      
Stock options exercised, value $ 1,585 $ 8 1,577    
Stock options exercised, shares 100 82      
Vesting of restricted stock units, value   $ 31 (31)    
Vesting of restricted stock units, shares   311      
Shares withheld for taxes, value $ (2,231) $ (7) (2,224)    
Shares withheld for taxes, shares   (74)      
Dividends declared (22,621)     (22,621)  
Net income 23,425     23,425  
Other comprehensive income (loss) (5,635)       (5,635)
Ending Balances, value at Dec. 31, 2019 $ 1,014,832 $ 3,696 512,019 515,876 (16,759)
Balances, shares at Dec. 31, 2019 36,957 36,957      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense $ 10,398   10,398    
Shares repurchased and retired, value (25,220) $ (97) (10,704) (14,419)  
Shares repurchased and retired, shares   (964)      
Stock options exercised, value $ 958 $ 5 953    
Stock options exercised, shares 76 55      
Vesting of restricted stock units, value   $ 34 (34)    
Vesting of restricted stock units, shares   336      
Shares withheld for taxes, value $ (2,236) $ (9) (2,227)    
Shares withheld for taxes, shares   (89)      
Dividends declared (23,307)     (23,307)  
Net income 14,055     14,055  
Other comprehensive income (loss) 108       108
Ending Balances, value at Dec. 31, 2020 $ 989,588 $ 3,629 $ 510,405 $ 492,205 $ (16,651)
Balances, shares at Dec. 31, 2020 36,295 36,295