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Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Common Stock Outstanding [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2015 20,529,933          
Balance at Dec. 31, 2015 $ 21 $ 208,744 $ (51,798) $ (419) $ 29,547 $ 186,095
Net income 13,100 13,100
Other comprehensive loss (78) (78)
Equity-based compensation 6,236 $ 6,236
Purchase of Treasury stock (in shares) (180,013)         180,013
Purchase of Treasury stock $ (1) (3,416) $ (3,417)
Issuance of Treasury stock upon exercise of stock-based awards (in shares) 923,580          
Issuance of Treasury stock upon exercise of stock-based awards $ 1 (2,877) 15,707 (3,216) 9,615
Balance (in shares) at Dec. 31, 2016 21,273,500          
Balance at Dec. 31, 2016 $ 21 212,103 (39,507) (497) 39,431 211,551
Net income 17,028 17,028
Other comprehensive loss (89) (89)
Equity-based compensation 8,693 $ 8,693
Purchase of Treasury stock (in shares)           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 $ 1 (3,379) 13,451 (2,586) $ 7,487
Balance (in shares) at Dec. 31, 2017 22,064,007          
Balance at Dec. 31, 2017 $ 22 217,417 (26,056) (586) 53,873 244,670
Accumulated other comprehensive loss, net as of December 31, 2018           (586)
Net income 574 574
Other comprehensive loss (528) (528)
Equity-based compensation 10,367 $ 10,367
Purchase of Treasury stock (in shares) (655,876)         655,876
Purchase of Treasury stock (20,008) $ (20,008)
Issuance of Treasury stock upon exercise of stock-based awards (in shares) 379,729          
Issuance of Treasury stock upon exercise of stock-based awards (4,534) 6,932 (149) 2,249
Cumulative effect of adoption of new accounting standard (Note 2) 8,555 8,555
Balance (in shares) at Dec. 31, 2018 21,787,860          
Balance at Dec. 31, 2018 $ 22 $ 223,250 $ (39,132) (1,114) $ 62,853 245,879
Accumulated unrealized loss from available-for-sale securities, net of taxes of $177       (1,046)    
Accumulated unrealized loss from hedging activities, net of taxes of $9       (68)    
Accumulated other comprehensive loss, net as of December 31, 2018       $ (1,114)   $ (1,114)