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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, 2012   0      
Common stock, shares outstanding, beginning of period at Dec. 31, 2012     12,241,000    
Balance, beginning of period at Dec. 31, 2012 $ 175,825 $ 0 $ 122 $ 88,823 $ 86,880
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options, shares   0 53,000    
Exercise of common stock options 829 $ 0 $ 0 829 0
Compensation expense on common stock options 198 $ 0 $ 0 198 0
Issuance of restricted stock, shares   0 72,000    
Issuance of restricted stock 0 $ 0 $ 0 0 0
Tax benefit (expense) of equity compensation 10   0 10 0
Compensation expense on restricted common stock 1,485 $ 0 $ 1 1,484 0
Net income 14,390       14,390
Preferred stock, shares outstanding, end of period at Dec. 31, 2013   0      
Common stock, shares outstanding, end of period at Dec. 31, 2013     12,366,000    
Balance, end of period at Dec. 31, 2013 192,737 $ 0 $ 123 91,344 101,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options, shares   0 3,000    
Exercise of common stock options 59 $ 0 $ 0 59 0
Compensation expense on common stock options 426 $ 0 $ 0 426 0
Issuance of restricted stock, shares   0 97,000    
Issuance of restricted stock 0 $ 0 $ 0 0 0
Tax benefit (expense) of equity compensation 419   0 419 0
Compensation expense on restricted common stock 2,818 $ 0 $ 1 2,817 0
Net income $ 14,128       14,128
Preferred stock, shares outstanding, end of period at Dec. 31, 2014 0 0      
Common stock, shares outstanding, end of period at Dec. 31, 2014 12,466,000   12,466,000    
Balance, end 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   0 66,000    
Exercise of common stock options 776 $ 0 $ 1 775 0
Compensation expense on common stock options 601 $ 0 $ 0 601 0
Issuance of restricted stock, shares   0 71,000    
Issuance of restricted stock 0 $ 0 $ 0 0 0
Tax benefit (expense) of equity compensation (379)   0 (379) 0
Compensation expense on restricted common stock 2,944 $ 0 $ 1 2,943 0
Taxes paid related to net shares settlement of equity awards (695)     (695)  
Net income $ 10,147       10,147
Preferred stock, shares outstanding, end of period at Dec. 31, 2015 0 0      
Common stock, shares outstanding, end of period at Dec. 31, 2015 12,603,000   12,603,000    
Balance, end of period at Dec. 31, 2015 $ 223,981 $ 0 $ 126 $ 98,310 $ 125,545