v3.8.0.1
Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Treasury Stock
Retained Earnings
Beginning balance (shares) at Dec. 31, 2014   26,657,000      
Beginning balance at Dec. 31, 2014 $ 493,187 $ 267 $ 50,598 $ (88,134) $ 530,456
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 47,605       47,605
Exercise of stock options (shares)   58,000      
Exercise of stock options 1,728   1,728    
Tax benefit on exercise of stock options 40   40    
Stock-based compensation 658   658    
Dividend declared—$0.08 per share (1,657)       (1,657)
Purchase of treasury stock (2,922)     (2,922)  
Ending balance (shares) at Dec. 31, 2015   26,715,000      
Ending balance at Dec. 31, 2015 538,639 $ 267 53,024 (91,056) 576,404
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 33,839       33,839
Exercise of stock options (shares)   48,000      
Exercise of stock options 1,437 $ 1 1,436    
Tax benefit on exercise of stock options 60   60    
Stock-based compensation 791   791    
Dividend declared—$0.08 per share (1,657)       (1,657)
Ending balance (shares) at Dec. 31, 2016   26,763,000      
Ending balance at Dec. 31, 2016 573,109 $ 268 55,311 (91,056) 608,586
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 67,017       67,017
Exercise of stock options (shares) 91,500 91,000      
Exercise of stock options $ 1,927 $ 1 1,926    
Stock-based compensation (shares)   5,000      
Stock-based compensation 955   955    
Dividend declared—$0.08 per share (1,663)       (1,663)
Ending balance (shares) at Dec. 31, 2017   26,859,000      
Ending balance at Dec. 31, 2017 $ 641,345 $ 269 $ 58,192 $ (91,056) $ 673,940