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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Paid-in Capital
Retained Earnings
Balance (in shares) at Dec. 31, 2014   54,042    
Balance at Dec. 31, 2014 $ 174,059 $ 216 $ 0 $ 173,843
Net income 45,728     45,728
Stock options exercised and restricted stock awards granted, including tax benefits (in shares)   546    
Stock options exercised and restricted stock awards granted, including tax benefits 5,240 $ 2 5,238  
Share-based compensation 2,891   2,891  
Stock repurchased and retired (in shares)   (1,576)    
Stock repurchased and retired (37,143) $ (6) (8,129) (29,008)
Dividends (11,857)     (11,857)
Balance (in shares) at Dec. 31, 2015   53,012    
Balance at Dec. 31, 2015 178,918 $ 212 0 178,706
Net income 53,376     53,376
Stock options exercised and restricted stock awards granted, including tax benefits (in shares)   375    
Stock options exercised and restricted stock awards granted, including tax benefits 2,063 $ 2 2,061  
Share-based compensation 4,357   4,357  
Stock repurchased and retired (in shares)   (736)    
Stock repurchased and retired (20,140) $ (3) (6,418) (13,719)
Dividends (12,676)     (12,676)
Balance (in shares) at Dec. 31, 2016   52,651    
Balance at Dec. 31, 2016 205,898 $ 211 0 205,687
Net income 54,498     54,498
Stock options exercised and restricted stock awards granted, including tax benefits (in shares)   293    
Stock options exercised and restricted stock awards granted, including tax benefits 2,259 $ 1 2,258  
Share-based compensation 6,458   6,458  
Stock repurchased and retired (in shares)   (522)    
Stock repurchased and retired (18,234) $ (2) (8,716) (9,516)
Dividends (13,653)     (13,653)
Balance (in shares) at Dec. 31, 2017   52,422    
Balance at Dec. 31, 2017 $ 237,226 $ 210 $ 0 $ 237,016