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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Capital in Excess of Par Value
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adoption of accounting standard (Note 1) $ (3,457)     $ (68,127)   $ 1,980 $ (69,604)
Balance at Dec. 31, 2017 $ 3,457     68,127   (1,980) 69,604
Balance (in shares) at Dec. 31, 2017 34,572,000            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock issued for stock incentive plans, net $ 19 $ 2,070         2,089
Stock issued for stock incentive plans, net (in shares) 190,000            
Adoption of accounting standard (Note 1) $ (3,433)     (73,954)   2,175 (75,212)
Stock purchased and retired $ (43) (2,070)   (5,409)     (7,522)
Stock purchased and retired (in shares) (434,000)            
Net income       28,488     28,488
Pension adjustment, net of taxes           (242) (242)
Unrealized gain on securities, net of taxes and reclassification adjustment           47 47
Dividends declared       (17,252)     (17,252)
Balance at Dec. 31, 2018 $ 3,433     73,954   (2,175) 75,212
Balance (in shares) at Dec. 31, 2018 34,328,000            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adoption of accounting standard (Note 1) $ (3,433)     (73,954)   2,175 (75,212)
Stock issued for stock incentive plans, net $ 13 2,110         2,123
Stock issued for stock incentive plans, net (in shares) 129,000            
Adoption of accounting standard (Note 1) $ (3,387)   $ 414 (76,573) $ (414) 2,748 (75,212)
Stock purchased and retired $ (59) (2,110)   (6,278)     (8,447)
Stock purchased and retired (in shares) (587,000)            
Net income       28,239     28,239
Pension adjustment, net of taxes           (166) (166)
Unrealized gain on securities, net of taxes and reclassification adjustment           7 7
Dividends declared       (19,756)     (19,756)
Balance at Dec. 31, 2019 $ 3,387   (414) 76,573 414 (2,748) $ 77,212
Balance (in shares) at Dec. 31, 2019 33,870,000           33,869,817
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adoption of accounting standard (Note 1) $ (3,387)   414 (76,573) (414) 2,748 $ (77,212)
Stock issued for stock incentive plans, net $ 17 3,085         3,102
Stock issued for stock incentive plans, net (in shares) 173,000            
Adoption of accounting standard (Note 1) $ (3,387)   $ 414 (83,079) $ (414) 1,947 (77,212)
Stock purchased and retired $ (17) $ (3,085)   612     (2,490)
Stock purchased and retired (in shares) (174,000)            
Net income       19,444     19,444
Pension adjustment, net of taxes           801 801
Dividends declared       (13,550)     (13,550)
Balance at Dec. 31, 2020 $ 3,387     83,079   (1,947) $ 84,519
Balance (in shares) at Dec. 31, 2020 33,869,000           33,868,624
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adoption of accounting standard (Note 1) $ (3,387)     $ (83,079)   $ 1,947 $ (84,519)