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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid In Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income [Member]
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 30,347     30,347    
Purchase of remaining interest in subsidiary (1,890)   (1,890)      
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 (550)       $ (550)  
Surrender of common stock awards by employees, shares         (11,971)  
Share-based compensation expense 4,360   4,360      
Share-based compensation issued to directors, value 300   300      
Share-based compensation issued to directors, shares   5,940        
Other comprehensive (loss) income, net of tax (45)         $ (45)
BALANCE at Sep. 30, 2017 197,358 $ 325 172,206 37,641   (45)
BALANCE, Shares at Sep. 30, 2017   32,524,934        
BALANCE, Treasury Stock, Value at Sep. 30, 2017         $ (12,769)  
BALANCE, Treasury Stock, Shares at Sep. 30, 2017         (662,373)  
BALANCE at Dec. 31, 2017 $ 210,528 $ 325 174,043 48,434 $ (12,781) 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 $ 38,272     38,272    
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         (42,799)  
Share-based compensation expense 5,965   5,965      
Share-based compensation issued to directors, value 100   100      
Share-based compensation issued to directors, shares   4,945        
Common stock repurchase, value (42,827)       $ (42,827)  
Common stock repurchase, shares         (793,411)  
Other comprehensive (loss) income, net of tax 2,453         2,453
BALANCE at Sep. 30, 2018 $ 214,351 $ 327 $ 180,106 $ 88,736   $ 3,072
BALANCE, Shares at Sep. 30, 2018 32,723,972 32,723,972        
BALANCE, Treasury Stock, Value at Sep. 30, 2018 $ (57,890)       $ (57,890)  
BALANCE, Treasury Stock, Shares at Sep. 30, 2018 (1,498,998)       (1,498,998)