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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 (Loss) [Member]
BALANCE at Dec. 31, 2017 $ 210,528 $ 325 $ 174,043 $ 48,434   $ 507
BALANCE, Shares at Dec. 31, 2017   32,524,934        
BALANCE, Treasury Stock, Value at Dec. 31, 2017         $ (12,781)  
BALANCE, Treasury Stock, Shares at Dec. 31, 2017         (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 income (loss), 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        
BALANCE, Treasury Stock, Value at Sep. 30, 2018         $ (57,890)  
BALANCE, Treasury Stock, Shares at Sep. 30, 2018         (1,498,998)  
BALANCE at Jun. 30, 2018 215,063 $ 327 178,266 73,919   2,254
BALANCE, Shares at Jun. 30, 2018   32,723,972        
BALANCE, Treasury Stock, Value at Jun. 30, 2018         $ (39,703)  
BALANCE, Treasury Stock, Shares at Jun. 30, 2018         (1,117,623)  
Net income 15,563     15,563    
Cumulative effect of accounting changes, net of tax (746)     (746)    
Surrender of common stock awards by employees, shares         (681)  
Share-based compensation expense 1,765   1,765      
Share-based compensation issued to directors, value 75   75      
Common stock repurchase, value (18,187)       $ (18,187)  
Common stock repurchase, shares         (380,694)  
Other comprehensive income (loss), net of tax 818         818
BALANCE at Sep. 30, 2018 214,351 $ 327 180,106 88,736   3,072
BALANCE, Shares at Sep. 30, 2018   32,723,972        
BALANCE, Treasury Stock, Value at Sep. 30, 2018         $ (57,890)  
BALANCE, Treasury Stock, Shares at Sep. 30, 2018         (1,498,998)  
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)  
Net income $ 48,965     48,965    
Issuance of common stock awards to employees, value   $ 2 (2)      
Issuance of common stock awards to employees, shares   139,862        
Surrender of common stock awards by employees, value (2,331)       $ (2,331)  
Surrender of common stock awards by employees, shares         (46,394)  
Share-based compensation expense 6,144   6,144      
Share-based compensation issued to directors, value 259   259      
Share-based compensation issued to directors, shares   7,670        
Other comprehensive income (loss), net of tax (8,021)         (8,021)
BALANCE at Sep. 30, 2019 $ 227,514 $ 329 188,216 154,177   (8,452)
BALANCE, Shares at Sep. 30, 2019 32,871,504 32,871,504        
BALANCE, Treasury Stock, Value at Sep. 30, 2019 $ (106,756)       $ (106,756)  
BALANCE, Treasury Stock, Shares at Sep. 30, 2019 (2,854,755)       (2,854,755)  
BALANCE at Jun. 30, 2019 $ 206,002 $ 329 186,182 132,965   (6,726)
BALANCE, Shares at Jun. 30, 2019   32,871,504        
BALANCE, Treasury Stock, Value at Jun. 30, 2019         $ (106,748)  
BALANCE, Treasury Stock, Shares at Jun. 30, 2019         (2,854,496)  
Net income 21,212     21,212    
Surrender of common stock awards by employees, value (8)       $ (8)  
Surrender of common stock awards by employees, shares         (259)  
Share-based compensation expense 1,933   1,933      
Share-based compensation issued to directors, value 101   101      
Other comprehensive income (loss), net of tax (1,726)         (1,726)
BALANCE at Sep. 30, 2019 $ 227,514 $ 329 $ 188,216 $ 154,177   $ (8,452)
BALANCE, Shares at Sep. 30, 2019 32,871,504 32,871,504        
BALANCE, Treasury Stock, Value at Sep. 30, 2019 $ (106,756)       $ (106,756)  
BALANCE, Treasury Stock, Shares at Sep. 30, 2019 (2,854,755)       (2,854,755)