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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Capital in Excess of Par Value [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2016 $ 47,872 $ 96,850 $ 336,464 $ (11,028) $ (29,130) $ 441,028
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 0 0 46,623 0 0 46,623
Other comprehensive income (loss), net of tax 0 0 0 7,037 0 7,037
Cash dividends paid 0 0 (12,990) 0 0 (12,990)
Purchase of treasury stock 0 0 0 0 (20,000) (20,000)
Stock-based compensation 0 4,309 0 0 1,354 5,663
Employee Stock Ownership Plan 0 1,014 0 0 1,145 2,159
Balance at Sep. 30, 2017 47,872 102,173 370,097 (3,991) (46,631) 469,520
Balance at Jun. 30, 2017       (5,487)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings           13,125
Other comprehensive income (loss), net of tax           1,496
Balance at Sep. 30, 2017 $ 47,872 $ 102,173 $ 370,097 $ (3,991) $ (46,631) $ 469,520