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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid- In Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2019 $ 12   $ 25 $ 168,788 $ (63,993) $ 104,832
Balance (in shares) at Dec. 31, 2019 12,272,000          
Net income       18,477   18,477
Share-based compensation   $ 981       981
Share-based compensation (in shares) 7,000          
Net shares repurchased for employee taxes   (487)       (487)
Net shares repurchased for employee taxes, (in shares) (5,000)          
Treasury stock retired from stock repurchases       (63,993) 63,993  
Treasury stock retired from stock repurchases, (in shares) (489,000)          
Other comprehensive income     45     45
Cash dividends declared to stockholders       (13,099)   (13,099)
Balance at Mar. 31, 2020 $ 12 494 70 110,173   110,749
Balance (in shares) at Mar. 31, 2020 11,785,000          
Balance at Dec. 31, 2019 $ 12   25 168,788 (63,993) 104,832
Balance (in shares) at Dec. 31, 2019 12,272,000          
Net income           $ 74,865
Net shares repurchased for employee taxes, (in shares)           (5,432)
Other comprehensive income           $ 72
Balance at Sep. 30, 2020 $ 12 5,135 97 139,770 (5,000) 140,014
Balance (in shares) at Sep. 30, 2020 11,817,000          
Balance at Mar. 31, 2020 $ 12 494 70 110,173   110,749
Balance (in shares) at Mar. 31, 2020 11,785,000          
Net income       21,935   21,935
Share-based compensation   1,136       1,136
Options exercised by executives and directors   1,250       1,250
Options exercised by executives and directors (in shares) 21,000          
Net shares repurchased for employee taxes   (9)       (9)
Treasury stock from stock repurchases         (5,000) (5,000)
Other comprehensive income     29     29
Cash dividends declared to stockholders       (13,354)   (13,354)
Balance at Jun. 30, 2020 $ 12 2,871 99 118,754 (5,000) 116,736
Balance (in shares) at Jun. 30, 2020 11,806,000          
Net income       34,453   34,453
Share-based compensation   2,126       2,126
Share-based compensation (in shares) 9,000          
Options exercised by executives and directors   174       174
Options exercised by executives and directors (in shares) 2,000          
Net shares repurchased for employee taxes   (36)       (36)
Other comprehensive income     (2)     (2)
Cash dividends declared to stockholders       (13,437)   (13,437)
Balance at Sep. 30, 2020 $ 12 5,135 97 139,770 (5,000) 140,014
Balance (in shares) at Sep. 30, 2020 11,817,000          
Balance at Dec. 31, 2020 $ 12 7,842 41 154,351 (5,000) 157,246
Balance (in shares) at Dec. 31, 2020 11,822,000          
Net income       41,063   41,063
Share-based compensation   2,198       2,198
Share-based compensation (in shares) 13,000          
Options exercised by executives and directors   481       481
Options exercised by executives and directors (in shares) 11,000          
Net shares repurchased for employee taxes   (1,807)       (1,807)
Net shares repurchased for employee taxes, (in shares) (7,000)          
Treasury stock from stock repurchases         (7,500) (7,500)
Other comprehensive income     62     62
Cash dividends declared to stockholders       (16,852)   (16,852)
Balance at Mar. 31, 2021 $ 12 8,714 103 178,562 (12,500) 174,891
Balance (in shares) at Mar. 31, 2021 11,839,000          
Balance at Dec. 31, 2020 $ 12 7,842 41 154,351 (5,000) 157,246
Balance (in shares) at Dec. 31, 2020 11,822,000          
Net income           $ 130,008
Net shares repurchased for employee taxes, (in shares)           (7,226)
Other comprehensive income           $ 81
Balance at Sep. 30, 2021 $ 12 12,950 122 183,155   196,239
Balance (in shares) at Sep. 30, 2021 11,618,000          
Balance at Mar. 31, 2021 $ 12 8,714 103 178,562 (12,500) 174,891
Balance (in shares) at Mar. 31, 2021 11,839,000          
Net income       46,963   46,963
Share-based compensation   1,697   142   1,839
Share-based compensation (in shares) 10,000          
Options exercised by executives and directors   221       221
Options exercised by executives and directors (in shares) 3,000          
Net shares repurchased for employee taxes   (26)       (26)
Treasury stock from stock repurchases         (12,230) (12,230)
Treasury stock retired from stock repurchases       (23,383) 23,383  
Treasury stock retired from stock repurchases, (in shares) (114,000)          
Other comprehensive income     (28)     (28)
Cash dividends declared to stockholders       (16,941)   (16,941)
Balance at Jun. 30, 2021 $ 12 10,606 75 185,343 (1,347) 194,689
Balance (in shares) at Jun. 30, 2021 11,738,000          
Net income       41,982   41,982
Share-based compensation $ 1 2,269       2,269
Options exercised by executives and directors   109       109
Options exercised by executives and directors (in shares) 3,000          
Net shares repurchased for employee taxes   (34)       (34)
Net shares repurchased for employee taxes, (in shares) (1,000)          
Treasury stock from stock repurchases         (26,270) (26,270)
Treasury stock retired from stock repurchases       (27,617) $ 27,617  
Treasury stock retired from stock repurchases, (in shares) (123,000)          
Other comprehensive income     47     47
Cash dividends declared to stockholders       (16,553)   (16,553)
Balance at Sep. 30, 2021 $ 12 $ 12,950 $ 122 $ 183,155   $ 196,239
Balance (in shares) at Sep. 30, 2021 11,618,000