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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Capital in Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Total
Balance at Dec. 31, 2014 $ 3,813 $ 3,895 $ 77,755 $ (1,969) $ 83,494
Balance (in shares) at Dec. 31, 2014 38,131,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 32 1,953     1,985
Stock issued for stock incentive plans, net (in shares) 317,000        
Stock purchased and retired $ (34) (2,225)     (2,259)
Stock purchased and retired (in shares) (336,000)        
Net income     14,306   14,306
Pension adjustment, net of taxes       125 125
Unrealized loss on securities, net of taxes and reclassification adjustments       (57) (57)
Excess tax benefits for share-based payments   256     256
Dividends declared     (7,638)   (7,638)
Balance at Dec. 31, 2015 $ 3,811 3,879 84,423 (1,901) 90,212
Balance (in shares) at Dec. 31, 2015 38,112,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 37 2,511     2,548
Stock issued for stock incentive plans, net (in shares) 369,000        
Stock purchased and retired $ (362) (6,550) (27,825)   (34,737)
Stock purchased and retired (in shares) (3,626,000)        
Net income     16,745   16,745
Pension adjustment, net of taxes       (252) (252)
Unrealized loss on securities, net of taxes and reclassification adjustments       (29) (29)
Excess tax benefits for share-based payments   160     160
Dividends declared     (9,202)   (9,202)
Balance at Dec. 31, 2016 $ 3,486   64,141 (2,182) $ 65,445
Balance (in shares) at Dec. 31, 2016 34,855,000       34,855,082
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 18 2,664     $ 2,682
Stock issued for stock incentive plans, net (in shares) 184,000        
Stock purchased and retired $ (47) $ (2,664) (3,810)   (6,521)
Stock purchased and retired (in shares) (467,000)        
Net income     19,300   19,300
Pension adjustment, net of taxes       215 215
Unrealized loss on securities, net of taxes and reclassification adjustments       (13) (13)
Dividends declared     (11,504)   (11,504)
Balance at Dec. 31, 2017 $ 3,457   $ 68,127 $ (1,980) $ 69,604
Balance (in shares) at Dec. 31, 2017 34,572,000       34,572,157