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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in-Capital [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2013 $ 161,173 $ 1,265 $ 83,317 $ 76,591
Beginning Balance, shares at Dec. 31, 2013   12,652    
Issuance of restricted stock awards   $ 7 (7)  
Issuance of restricted stock awards, shares   73    
Exercise of stock options 123 $ 5 118  
Exercise of stock options, shares   46    
Excess tax benefit from exercise of stock options 161   161  
Shares withheld related to net share settlement (196) $ (2) (194)  
Shares withheld related to net share settlement, shares   (23)    
Share-based compensation 2,260   2,260  
Net income 14,802     14,802
Ending Balance at Dec. 31, 2014 178,323 $ 1,275 85,655 91,393
Ending Balance, shares at Dec. 31, 2014   12,748    
Issuance of restricted stock awards, net of forfeiture   $ 11 (11)  
Issuance of restricted stock awards, shares   108    
Exercise of stock options $ 14 $ 14    
Exercise of stock options, shares 145 145    
Excess tax benefit from exercise of stock options $ 378   378  
Shares withheld related to net share settlement (544) $ (9) (535)  
Shares withheld related to net share settlement, shares   (87)    
Share-based compensation 3,426   3,426  
Net income 15,998     15,998
Ending Balance at Sep. 30, 2015 $ 197,595 $ 1,291 $ 88,913 $ 107,391
Ending Balance, shares at Sep. 30, 2015   12,914