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STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury stock
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Beginning balance at Dec. 31, 2014 $ 179,049 $ 20 $ 209,426 $ (54,708) $ (436) $ 24,747
Beginning balance (in shares) at Dec. 31, 2014   20,252,490        
Net income 6,267         6,267
Other comprehensive income (loss) 17       17  
Equity-based compensation 4,015   4,015      
Tax benefit related to exercise of stock-based awards $ 112   112      
Purchase of Treasury stock, (in shares) (508,931) (508,931)        
Purchase of Treasury stock $ (10,078)     (10,078)    
Issuance of Treasury stock upon exercise of stock-based awards (in shares)   786,374        
Issuance of Treasury stock upon exercise of stock-based awards 6,713 $ 1 (4,809) 12,988   (1,467)
Ending balance at Dec. 31, 2015 186,095 $ 21 208,744 (51,798) (419) 29,547
Ending balance (in shares) at Dec. 31, 2015   20,529,933        
Net income 13,100         13,100
Other comprehensive income (loss) (78)       (78)  
Equity-based compensation $ 6,236   6,236      
Purchase of Treasury stock, (in shares) (180,013) (180,013)        
Purchase of Treasury stock $ (3,417) $ (1)   (3,416)    
Issuance of Treasury stock upon exercise of stock-based awards (in shares)   923,580        
Issuance of Treasury stock upon exercise of stock-based awards 9,615 $ 1 (2,877) 15,707   (3,216)
Ending balance at Dec. 31, 2016 $ 211,551 $ 21 212,103 (39,507) (497) 39,431
Ending balance (in shares) at Dec. 31, 2016 21,273,500 21,273,500        
Net income $ 17,028         17,028
Other comprehensive income (loss) (89)       (89)  
Equity-based compensation $ 8,693   8,693      
Purchase of Treasury stock, (in shares) 0          
Purchase of Treasury stock $ 0          
Issuance of Treasury stock upon exercise of stock-based awards (in shares)   790,507        
Issuance of Treasury stock upon exercise of stock-based awards 7,487 $ 1 (3,379) 13,451   (2,586)
Ending balance at Dec. 31, 2017 $ 244,670 $ 22 $ 217,417 $ (26,056) $ (586) [1] $ 53,873
Ending balance (in shares) at Dec. 31, 2017 22,064,007 22,064,007        
[1] Accumulated other comprehensive loss for the year ended December 31, 2017 is all from available-for-sale securities, net of taxes of $92.