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CONSOLIDATED STATEMENTS OF EQUITY - USD ($)
$ in Thousands
Total
Total Stockholders' Equity
Common Stock
Class A Common Stock
Common Stock
Class B Common Stock
Capital in Excess of Par Value
Retained Earnings
Deferred Gain (Loss) on Available for Sale 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         2,891   (2,731)
Stock-based compensation   3,958 108   3,850      
Purchase of treasury shares   (1,294) (39)   (1,255)      
Conversion of Class B to Class A shares   0 1 (1)        
Net income 34,785 34,785       34,785    
Cash dividends on common stock   (4,578)       (4,578)    
Current period other comprehensive income, net of tax   (301)         0 (301)
Pension settlement, net of tax 0              
Reclassification adjustment to net income, net of tax   489           489
Balance, end 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   4,924 117   4,807      
Purchase of treasury shares   (3,010) (72)   (2,938)      
Net income 39,632 39,632       39,632    
Cash dividends on common stock   (5,132)       (5,132)    
Current period other comprehensive income, net of tax   758           758
Pension settlement, net of tax $ 671 671           671
Reclassification adjustment to net income, net of tax   845           845
Balance, end of period at Dec. 31, 2019   $ 289,392 $ 5,397 $ 1,569 $ 8,911 $ 284,852 $ 0 $ (11,337)