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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]
Treasury Stock [Member]
Beginning Balance at Dec. 31, 2014 $ 178,323 $ 1,275 $ 85,655 $ 91,393  
Beginning Balance, shares at Dec. 31, 2014   12,748      
Issuance of restricted stock awards   $ 11 (11)    
Issuance of restricted stock awards, shares   108      
Exercise of stock options 14 $ 14      
Exercise of stock options, shares   145      
Excess tax benefit from exercise of stock options 378   378    
Shares withheld related to net share settlement (543) $ (9) (534)    
Shares withheld related to net share settlement, shares   (87)      
Share-based compensation 3,690   3,690    
Net income 23,365     23,365  
Ending Balance at Dec. 31, 2015 205,227 $ 1,291 89,178 $ 114,758  
Ending Balance, shares at Dec. 31, 2015   12,914      
Issuance of restricted stock awards   $ 4 (4)    
Issuance of restricted stock awards, shares   36      
Exercise of stock options $ 4 $ 4      
Exercise of stock options, shares 45 45      
Excess tax benefit from exercise of stock options $ 15   $ 15    
Repurchase of common stock $ (25,046)       $ (25,046)
Repurchase of common stock, shares 0 0 0 0 0
Shares withheld related to net share settlement $ (105) $ (3) $ (102)    
Shares withheld related to net share settlement, shares   (34)      
Share-based compensation 1,741   1,741    
Net income 11,088     $ 11,088  
Ending Balance at Jun. 30, 2016 $ 192,924 $ 1,296 $ 90,828 $ 125,846 $ (25,046)
Ending Balance, shares at Jun. 30, 2016   12,961