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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2017 $ 24,092 $ 28,329 $ 321,323 $ (143,595) $ 230,149
Net income     50,933   50,933
Dividends paid     (19,201)   (19,201)
Stock-based compensation   5,809     5,809
Vesting of RSU's   (816)     (816)
Common stock issued - compensation plans 31 (31)    
Unpaid dividends accrued     (405)   (405)
Adoption of ASC 606 (Note 3)     (2,227)   (2,227)
Balance at Dec. 31, 2018 24,123 33,291 350,423 (143,595) 264,242
Net income     32,291   32,291
Dividends paid     (14,319)   (14,319)
Stock-based compensation   6,330     6,330
Vesting of RSU's   (901)     (901)
Common stock issued - compensation plans 37 (37)    
Unpaid dividends accrued     (190)   (190)
Repurchase of 44,500 shares of common stock       (1,995) (1,995)
Balance at Dec. 31, 2019 24,160 38,683 368,205 (145,590) 285,458
Net income     90,398   90,398
Dividends paid     (113,896)   (113,896)
Stock-based compensation   6,128     6,128
Vesting of RSU's   (1,297)     (1,297)
Common stock issued - compensation plans 46 (46)    
Unpaid dividends accrued     (2,092)   (2,092)
Balance at Dec. 31, 2020 $ 24,206 $ 43,468 $ 342,615 $ (145,590) $ 264,699