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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock
Treasury Stock
Additional Paid-In Capital
Retained Earnings
Total
BALANCE at Dec. 31, 2018     $ 411 $ (87,747) $ 316,479 $ 268,904 $ 498,047
BALANCE (in shares) at Dec. 31, 2018     41,123,365        
BALANCE (in shares) at Dec. 31, 2018       (4,229,653)      
Increase (Decrease) in Stockholders' Equity              
Net income           19,866 19,866
Issuance of Stock:              
Issuance of shares for options exercised       $ 861 (61)   800
Issuance of shares for options exercised (in shares)       41,103      
Issuance of restricted stock & performance stock       $ 817 1,189   2,006
Issuance of restricted stock & performance stock (in shares)       38,539      
Shares received in lieu of tax withholding payment on vested restricted stock       $ (781)     (781)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)       (15,013)      
Stock-based compensation         2,084   2,084
Dividends           (3,506) (3,506)
Share repurchase       $ (3,321)     (3,321)
Share repurchase (in shares)       (67,394)      
BALANCE at Mar. 31, 2019     $ 411 $ (90,171) 319,691 285,264 515,195
BALANCE (in shares) at Mar. 31, 2019     41,123,365        
BALANCE (in shares) at Mar. 31, 2019       (4,232,418)      
BALANCE at Dec. 31, 2018     $ 411 $ (87,747) 316,479 268,904 498,047
BALANCE (in shares) at Dec. 31, 2018     41,123,365        
BALANCE (in shares) at Dec. 31, 2018       (4,229,653)      
Increase (Decrease) in Stockholders' Equity              
Net income             80,272
BALANCE at Sep. 30, 2019     $ 411 $ (101,243) 320,157 338,305 557,630
BALANCE (in shares) at Sep. 30, 2019     41,123,365        
BALANCE (in shares) at Sep. 30, 2019       (4,447,438)      
BALANCE at Mar. 31, 2019     $ 411 $ (90,171) 319,691 285,264 515,195
BALANCE (in shares) at Mar. 31, 2019     41,123,365        
BALANCE (in shares) at Mar. 31, 2019       (4,232,418)      
Increase (Decrease) in Stockholders' Equity              
Net income           24,173 24,173
Issuance of Stock:              
Issuance of shares for options exercised       $ 31 (11)   20
Issuance of shares for options exercised (in shares)       1,408      
Issuance of restricted stock & performance stock       $ 1,486 (1,486)    
Issuance of restricted stock & performance stock (in shares)       69,067      
Shares received in lieu of tax withholding payment on vested restricted stock       $ (717)     (717)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)       (13,573)      
Stock-based compensation         1,685   1,685
Dividends           (3,692) (3,692)
Share repurchase       $ (4,576)     (4,576)
Share repurchase (in shares)       (93,468)      
BALANCE at Jun. 30, 2019     $ 411 $ (93,947) 319,879 305,745 532,088
BALANCE (in shares) at Jun. 30, 2019     41,123,365        
BALANCE (in shares) at Jun. 30, 2019       (4,268,984)      
Increase (Decrease) in Stockholders' Equity              
Net income           36,233 36,233
Issuance of Stock:              
Issuance of shares for options exercised       $ 124 57   181
Issuance of shares for options exercised (in shares)       5,426      
Stock-based compensation         221   221
Dividends           (3,673) (3,673)
Share repurchase       $ (7,420)     (7,420)
Share repurchase (in shares)       (183,880)      
BALANCE at Sep. 30, 2019     $ 411 $ (101,243) 320,157 338,305 557,630
BALANCE (in shares) at Sep. 30, 2019     41,123,365        
BALANCE (in shares) at Sep. 30, 2019       (4,447,438)      
BALANCE at Dec. 31, 2019 $ (515) $ (515) $ 411 $ (103,960) 320,168 368,685 $ 585,304
BALANCE (in shares) at Dec. 31, 2019     41,123,365       41,123,365
BALANCE (in shares) at Dec. 31, 2019       (4,465,448)     4,465,448
Increase (Decrease) in Stockholders' Equity              
Net income           17,716 $ 17,716
Issuance of Stock:              
Issuance of restricted stock & performance stock       $ 1,054 801   1,855
Issuance of restricted stock & performance stock (in shares)       43,902      
Shares received in lieu of tax withholding payment on vested restricted stock       $ (622)     (622)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)       (14,722)      
Stock-based compensation         2,134   2,134
Dividends           (3,844) (3,844)
Share repurchase       $ (8,985)     (8,985)
Share repurchase (in shares)       (237,359)      
BALANCE at Mar. 31, 2020     $ 411 $ (112,513) 323,103 382,042 593,043
BALANCE (in shares) at Mar. 31, 2020     41,123,365        
BALANCE (in shares) at Mar. 31, 2020       (4,673,627)      
BALANCE at Dec. 31, 2019 $ (515) $ (515) $ 411 $ (103,960) 320,168 368,685 $ 585,304
BALANCE (in shares) at Dec. 31, 2019     41,123,365       41,123,365
BALANCE (in shares) at Dec. 31, 2019       (4,465,448)     4,465,448
Increase (Decrease) in Stockholders' Equity              
Net income             $ 107,299
BALANCE at Sep. 30, 2020     $ 411 $ (118,551) 322,304 463,962 $ 668,126
BALANCE (in shares) at Sep. 30, 2020     41,123,365       41,123,365
BALANCE (in shares) at Sep. 30, 2020       (4,723,672)     4,723,672
BALANCE at Mar. 31, 2020     $ 411 $ (112,513) 323,103 382,042 $ 593,043
BALANCE (in shares) at Mar. 31, 2020     41,123,365        
BALANCE (in shares) at Mar. 31, 2020       (4,673,627)      
Increase (Decrease) in Stockholders' Equity              
Net income           39,495 39,495
Issuance of Stock:              
Issuance of shares for options exercised       $ 836 (280)   556
Issuance of shares for options exercised (in shares)       34,562      
Issuance of restricted stock & performance stock       $ 2,048 (2,048)    
Issuance of restricted stock & performance stock (in shares)       84,987      
Shares received in lieu of tax withholding payment on vested restricted stock       $ (454)     (454)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)       (13,002)      
Stock-based compensation         1,644   1,644
Dividends           (3,830) (3,830)
Share repurchase       $ (2,021)     (2,021)
Share repurchase (in shares)       (52,991)      
BALANCE at Jun. 30, 2020     $ 411 $ (112,104) 322,419 417,707 628,433
BALANCE (in shares) at Jun. 30, 2020     41,123,365        
BALANCE (in shares) at Jun. 30, 2020       (4,620,071)      
Increase (Decrease) in Stockholders' Equity              
Net income           50,088 50,088
Issuance of Stock:              
Issuance of shares for options exercised       $ 1,324 (325)   999
Issuance of shares for options exercised (in shares)       54,207      
Stock-based compensation         210   210
Dividends           (3,833) (3,833)
Share repurchase       $ (7,771)     (7,771)
Share repurchase (in shares)       (157,808)      
BALANCE at Sep. 30, 2020     $ 411 $ (118,551) $ 322,304 $ 463,962 $ 668,126
BALANCE (in shares) at Sep. 30, 2020     41,123,365       41,123,365
BALANCE (in shares) at Sep. 30, 2020       (4,723,672)     4,723,672