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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, 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)