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Unaudited Condensed Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Common Stock
Class A Common Stock
Common Stock
Class B Common Stock
Capital in Excess of Par Value
Retained Earnings
Pension and Postretirement Plan Adjustment
Balance, beginning of period at Dec. 31, 2018 $ 250,704 $ 5,352 $ 1,569 $ 7,042 $ 250,352 $ (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 (13,510)
Balance, beginning of period at Dec. 31, 2019 289,392 5,397 1,569 8,911 284,852 (11,337)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 465 88   377    
Purchase of treasury shares (1,002) (32)   (970)    
Net income 6,166       6,166  
Cash dividends on Class A and Class B common stock (1,339)       (1,339)  
Reclassification adjustment to net income, net of tax 155         155
Balance, end of period at Mar. 31, 2020 $ 293,837 $ 5,453 $ 1,569 $ 8,318 $ 289,679 $ (11,182)