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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Beginning balance, value at Dec. 31, 2014 $ 74,138 $ 538 $ 67,937 $ 5,663  
Beginning balance, shares at Dec. 31, 2014   53,832,782      
Vesting of restricted stock   $ 33 (33)    
Vesting of restricted stock, shares   3,287,091      
Stock-based compensation 3,231   3,231    
Net income 20,945     20,945  
Ending balance, value at Dec. 31, 2015 98,314 $ 571 71,135 26,608  
Ending balance, shares at Dec. 31, 2015   57,119,873      
Vesting of restricted stock   $ 14 (14)    
Vesting of restricted stock, shares   1,333,410      
Stock-based compensation 24,331   24,331    
Repurchases of common stock (49,958)       $ (49,958)
Repurchases of common stock, shares         1,122,261
Net income 43,840     43,840  
Ending balance, value at Dec. 31, 2016 116,527 $ 585 95,452 70,448 $ (49,958)
Ending balance, shares at Dec. 31, 2016   58,453,283     1,122,261
Vesting of restricted stock   $ 16 (16)    
Vesting of restricted stock, shares   1,696,128      
Stock-based compensation 41,798   41,798    
Repurchases of common stock (89,730)       $ (89,730)
Repurchases of common stock, shares         1,238,577
Net income 66,807     66,807  
Ending balance, value at Dec. 31, 2017 $ 135,402 $ 601 $ 137,234 $ 137,255 $ (139,688)
Ending balance, shares at Dec. 31, 2017   60,149,411     2,360,838