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Condensed 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, 2017   0      
Common stock, shares outstanding, beginning of period (in shares) at Dec. 31, 2017     12,880,000    
Balance, beginning 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)     9,000    
Exercise of common stock options 157     157  
Compensation expense on common stock options 66     66  
Issuance of restricted stock, shares (in shares)     60,000    
Issuance of restricted stock 0        
Compensation expense on restricted common stock 362     362  
Taxes paid related to net shares settlement of equity awards (495)     (495)  
Net income 225       225
Preferred stock, shares outstanding, end of period (in shares) at Mar. 31, 2018   0      
Common stock, shares outstanding, end of period (in shares) at Mar. 31, 2018     12,949,000    
Balance, end of period at Mar. 31, 2018 257,634 $ 0 $ 129 105,415 152,090
Preferred stock, shares outstanding, beginning of period (in shares) at Dec. 31, 2017   0      
Common stock, shares outstanding, beginning of period (in shares) at Dec. 31, 2017     12,880,000    
Balance, beginning of period at Dec. 31, 2017 257,319 $ 0 $ 129 105,325 151,865
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 472        
Preferred stock, shares outstanding, end of period (in shares) at Jun. 30, 2018   0      
Common stock, shares outstanding, end of period (in shares) at Jun. 30, 2018     12,968,000    
Balance, end of period at Jun. 30, 2018 258,395 $ 0 $ 130 105,928 152,337
Preferred stock, shares outstanding, beginning of period (in shares) at Mar. 31, 2018   0      
Common stock, shares outstanding, beginning of period (in shares) at Mar. 31, 2018     12,949,000    
Balance, beginning of period at Mar. 31, 2018 257,634 $ 0 $ 129 105,415 152,090
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Compensation expense on common stock options 31     31  
Issuance of restricted stock, shares (in shares)     19,000    
Issuance of restricted stock 0        
Compensation expense on restricted common stock 617   $ 1 616  
Taxes paid related to net shares settlement of equity awards (134)     (134)  
Net income 247       247
Preferred stock, shares outstanding, end of period (in shares) at Jun. 30, 2018   0      
Common stock, shares outstanding, end of period (in shares) at Jun. 30, 2018     12,968,000    
Balance, end of period at Jun. 30, 2018 $ 258,395 $ 0 $ 130 105,928 152,337
Preferred stock, shares outstanding, beginning of period (in shares) at Dec. 31, 2018 0 0      
Common stock, shares outstanding, beginning of period (in shares) at Dec. 31, 2018 13,005,000   13,005,000    
Balance, beginning of period at Dec. 31, 2018 $ 260,181 $ 0 $ 130 107,760 152,291
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options, shares (in shares)     57,000    
Exercise of common stock options 555     555  
Compensation expense on common stock options 31     31  
Issuance of restricted stock, shares (in shares)     71,000    
Issuance of restricted stock 0        
Compensation expense on restricted common stock 464   $ 1 463  
Taxes paid related to net shares settlement of equity awards (192)     (192)  
Net income 357       357
Preferred stock, shares outstanding, end of period (in shares) at Mar. 31, 2019   0      
Common stock, shares outstanding, end of period (in shares) at Mar. 31, 2019     13,133,000    
Balance, end of period at Mar. 31, 2019 $ 261,396 $ 0 $ 131 108,617 152,648
Preferred stock, shares outstanding, beginning of period (in shares) at Dec. 31, 2018 0 0      
Common stock, shares outstanding, beginning of period (in shares) at Dec. 31, 2018 13,005,000   13,005,000    
Balance, beginning of period at Dec. 31, 2018 $ 260,181 $ 0 $ 130 107,760 152,291
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 930        
Preferred stock, shares outstanding, end of period (in shares) at Jun. 30, 2019 0 0      
Common stock, shares outstanding, end of period (in shares) at Jun. 30, 2019 13,138,000   13,138,000    
Balance, end of period at Jun. 30, 2019 $ 262,570 $ 0 $ 131 109,218 153,221
Preferred stock, shares outstanding, beginning of period (in shares) at Mar. 31, 2019   0      
Common stock, shares outstanding, beginning of period (in shares) at Mar. 31, 2019     13,133,000    
Balance, beginning of period at Mar. 31, 2019 261,396 $ 0 $ 131 108,617 152,648
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options (50)     (50)  
Compensation expense on common stock options 30     30  
Issuance of restricted stock, shares (in shares)     5,000    
Issuance of restricted stock 0        
Compensation expense on restricted common stock 612     612  
Taxes paid related to net shares settlement of equity awards (9)     (9)  
Net income $ 573       573
Preferred stock, shares outstanding, end of period (in shares) at Jun. 30, 2019 0 0      
Common stock, shares outstanding, end of period (in shares) at Jun. 30, 2019 13,138,000   13,138,000    
Balance, end of period at Jun. 30, 2019 $ 262,570 $ 0 $ 131 $ 109,218 $ 153,221