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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 (in shares) at Dec. 31, 2015   0      
Common stock, shares outstanding, beginning of period (in shares) at Dec. 31, 2015     12,603,000    
Balance, beginning of period at Dec. 31, 2015 $ 223,981 $ 0 $ 126 $ 98,310 $ 125,545
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options, shares (in 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 (in shares)     99,000    
Issuance of restricted stock 0        
Tax benefit 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 (in shares) at Dec. 31, 2016   0      
Common stock, shares outstanding, end of period (in shares) at Dec. 31, 2016     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 (in shares)     56,000    
Exercise of common stock options 1,120     1,120  
Compensation expense on common stock options 363     363  
Issuance of restricted stock, shares (in 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 (in shares) at Dec. 31, 2017 0 0      
Common stock, shares outstanding, end of period (in shares) 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options, shares (in shares)     38,000    
Exercise of common stock options 680     680  
Compensation expense on common stock options 159     159  
Issuance of restricted stock, shares (in shares)     87,000    
Issuance of restricted stock 0        
Compensation expense on restricted common stock 2,226   $ 1 2,225  
Taxes paid related to net shares settlement of equity awards (629)     (629)  
Net income $ 426       426
Preferred stock, shares outstanding, end of period (in shares) at Dec. 31, 2018 0 0      
Common stock, shares outstanding, end of period (in shares) at Dec. 31, 2018 13,005,000   13,005,000    
Balance, end of period at Dec. 31, 2018 $ 260,181 $ 0 $ 130 $ 107,760 $ 152,291