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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-In Capital
Retained Earnings
Preferred stock, shares outstanding, beginning of period at Dec. 31, 2014   0      
Common stock, shares outstanding, beginning of period at Dec. 31, 2014     12,466,000    
Balance, beginning of period at Dec. 31, 2014 $ 210,587 $ 0 $ 124 $ 95,065 $ 115,398
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options, shares     66,000    
Exercise of common stock options 776   $ 1 775  
Compensation expense on common stock options 601     601  
Issuance of restricted stock, shares     71,000    
Issuance of restricted stock 0        
Tax benefit (expense) of equity compensation (379)     (379)  
Compensation expense on restricted common stock 2,944   $ 1 2,943  
Taxes paid related to net shares settlement of equity awards (695)     (695)  
Net income 10,147       10,147
Common stock, shares outstanding, end of period at Dec. 31, 2015     12,603,000    
Balance, end of period at Dec. 31, 2015 223,981   $ 126 98,310 125,545
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options, shares     62,000    
Exercise of common stock options 1,042   $ 1 1,041  
Compensation expense on common stock options 506     506  
Issuance of restricted stock, shares     99,000    
Issuance of restricted stock 0        
Tax benefit (expense) of equity compensation 72     72  
Compensation expense on restricted common stock 1,793   $ 1 1,792  
Taxes paid related to net shares settlement of equity awards (909)     (909)  
Net income $ 6,469       6,469
Preferred stock, shares outstanding, end of period at Dec. 31, 2016 0 0      
Common stock, shares outstanding, end of period at Dec. 31, 2016 12,764,000   12,764,000    
Balance, end of period at Dec. 31, 2016 $ 232,954 $ 0 $ 128 100,812 132,014
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options, shares     56,000    
Exercise of common stock options 1,120   $ 0 1,120  
Compensation expense on common stock options 363     363  
Issuance of restricted stock, shares     60,000    
Issuance of restricted stock 0        
Compensation expense on restricted common stock 3,675   $ 1 3,674  
Taxes paid related to net shares settlement of equity awards (644)     (644)  
Net income $ 19,851       19,851
Preferred stock, shares outstanding, end of period at Dec. 31, 2017 0 0      
Common stock, shares outstanding, end of period at Dec. 31, 2017 12,880,000   12,880,000    
Balance, end of period at Dec. 31, 2017 $ 257,319 $ 0 $ 129 $ 105,325 $ 151,865