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Unaudited Condensed Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Common Stock
Shares Outstanding Class A
Common Stock
Shares Outstanding Class B
Capital in Excess of Par Value
Retained Earnings
Deferred Gain (Loss) on Equity Securities
Pension and Postretirement Plan Adjustment
Balance, beginning of period at Dec. 31, 2017 $ 219,448 $ 5,282 $ 1,570 $ 4,447 $ 216,490 $ 2,727 $ (11,068)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
ASU 2018-02 adoption 160       2,339   (2,179)
Stock-based compensation 177 87   90      
Net income 8,176       8,176    
Cash dividends on Class A and Class B common stock (1,144)       (1,144)    
Reclassification adjustment to net income, net of tax 140           140
Balance, end of period at Mar. 31, 2018 224,882 5,369 1,570 4,537 226,513 0 (13,107)
Balance, beginning of period at Dec. 31, 2017 219,448 5,282 1,570 4,447 216,490 2,727 (11,068)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 14,569            
Balance, end of period at Jun. 30, 2018 230,972 5,375 1,569 5,269 231,761 0 (13,002)
Balance, beginning of period at Mar. 31, 2018 224,882 5,369 1,570 4,537 226,513 0 (13,107)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation 792 7   785      
Purchase of treasury shares (55) (2)   (53)      
Conversion of Class B to Class A shares 0 1 (1)        
Net income 6,393       6,393    
Cash dividends on Class A and Class B common stock (1,145)       (1,145)    
Reclassification adjustment to net income, net of tax 105           105
Balance, end of period at Jun. 30, 2018 230,972 5,375 1,569 5,269 231,761 0 (13,002)
Balance, beginning of period at Dec. 31, 2018 250,704 5,352 1,569 7,042 250,352 0 (13,611)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation 897 102   795      
Purchase of treasury shares (1,300) (36)   (1,264)      
Net income 15,018       15,018    
Cash dividends on Class A and Class B common stock (1,153)       (1,153)    
Reclassification adjustment to net income, net of tax 101           101
Balance, end of period at Mar. 31, 2019 264,267 5,418 1,569 6,573 264,217 0 (13,510)
Balance, beginning of period at Dec. 31, 2018 250,704 5,352 1,569 7,042 250,352 0 (13,611)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 22,993            
Balance, end of period at Jun. 30, 2019 272,150 5,421 1,569 7,734 270,865 0 (13,439)
Balance, beginning of period at Mar. 31, 2019 264,267 5,418 1,569 6,573 264,217 0 (13,510)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation 1,249 5   1,244      
Purchase of treasury shares (85) (2)   (83)      
Net income 7,975       7,975    
Cash dividends on Class A and Class B common stock (1,327)       (1,327)    
Reclassification adjustment to net income, net of tax 71           71
Balance, end of period at Jun. 30, 2019 $ 272,150 $ 5,421 $ 1,569 $ 7,734 $ 270,865 $ 0 $ (13,439)