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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid In Capital [Member]
Accumulated Deficit / Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE at Dec. 31, 2015 $ 114,483 $ 320 $ 156,688 $ (31,142)    
BALANCE, Shares at Dec. 31, 2015   31,982,888        
BALANCE, Treasury Stock, Value at Dec. 31, 2015         $ (11,383)  
BALANCE, Treasury Stock, Shares at Dec. 31, 2015         (616,560)  
Net income 38,436     38,436    
Issuance of common stock awards to employees, value   $ 1 (1)      
Issuance of common stock awards to employees, shares   143,528        
Surrender of common stock awards by employees, value (836)       $ (836)  
Surrender of common stock awards by employees, shares         (33,842)  
Share-based compensation expense 1,594   1,594      
Share-based compensation issued to directors, value 300   300      
Share-based compensation issued to directors, shares   8,760        
BALANCE at Dec. 31, 2016 153,977 $ 321 158,581 7,294    
BALANCE, Shares at Dec. 31, 2016   32,135,176        
BALANCE, Treasury Stock, Value at Dec. 31, 2016         $ (12,219)  
BALANCE, Treasury Stock, Shares at Dec. 31, 2016         (650,402)  
Net income 41,140     41,140    
Purchase of remaining interest in subsidiary (1,888)   (1,888)      
Issuance of common stock for acquisition, value 10,859 $ 3 10,856      
Issuance of common stock for acquisition, shares   282,577        
Issuance of common stock awards to employees, value   $ 1 (1)      
Issuance of common stock awards to employees, shares   101,241        
Surrender of common stock awards by employees, value (562)       $ (562)  
Surrender of common stock awards by employees, shares         (12,386)  
Share-based compensation expense 6,195   6,195      
Share-based compensation issued to directors, value 300   300      
Share-based compensation issued to directors, shares   5,940        
Other comprehensive income (loss), net of tax 507         $ 507
BALANCE at Dec. 31, 2017 $ 210,528 $ 325 174,043 48,434   507
BALANCE, Shares at Dec. 31, 2017 32,524,934 32,524,934        
BALANCE, Treasury Stock, Value at Dec. 31, 2017 $ (12,781)       $ (12,781)  
BALANCE, Treasury Stock, Shares at Dec. 31, 2017 (662,788)       (662,788)  
Net income $ 54,748     54,748    
Cumulative effect of accounting changes, net of tax 2,142     2,030   112
Issuance of common stock awards to employees, value   $ 2 (2)      
Issuance of common stock awards to employees, shares   194,093        
Surrender of common stock awards by employees, value (2,282)       $ (2,282)  
Surrender of common stock awards by employees, shares         (43,871)  
Share-based compensation expense 7,598   7,598      
Share-based compensation issued to directors, value 176   176      
Share-based compensation issued to directors, shares   4,945        
Common stock repurchase, value (89,362)       $ (89,362)  
Common stock repurchase, shares         (2,101,702)  
Other comprehensive income (loss), net of tax (1,050)         (1,050)
BALANCE at Dec. 31, 2018 $ 182,498 $ 327 $ 181,815 $ 105,212   $ (431)
BALANCE, Shares at Dec. 31, 2018 32,723,972 32,723,972        
BALANCE, Treasury Stock, Value at Dec. 31, 2018 $ (104,425)       $ (104,425)  
BALANCE, Treasury Stock, Shares at Dec. 31, 2018 (2,808,361)       (2,808,361)