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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Balance   $ 205,583     $ 205,583  
Net earnings $ 1,514   $ 1,523   5,482 $ 4,339
Foreign currency translation adjustments 100   (991)   230 (1,110)
Pension liability adjustment, net of tax         (231)  
Balance 205,885       205,885  
Common Stock [Member]            
Balance 9,995 10,057 10,268 $ 10,162 10,057 10,162
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price 7 1 89 108    
Restricted stock forfeited       (2)    
Issuance of restricted stock   1 2      
Shares purchased and retired   (64) (199)      
Balance 10,002 9,995 10,160 10,268 10,002 10,160
Capital in Excess Of Par Value [Member]            
Balance 64,634 64,263 59,013 55,884 64,263 55,884
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price 142 6 463 2,776    
Restricted stock forfeited       2    
Issuance of restricted stock   (1) (2)      
Share-based compensation expense 365 366 454 351    
Balance 65,141 64,634 59,928 59,013 65,141 59,928
Reinvested Earnings [Member]            
Balance 152,740 152,835 151,080 150,350 152,835 150,350
Net earnings 1,514 3,968 1,626 2,987    
Cash dividends declared (2,401) (2,299) (2,395) (2,257)    
Shares purchased and retired   (1,764) (6,390)      
Balance 151,853 152,740 143,921 151,080 151,853 143,921
Accumulated Other Comprehensive Loss [Member]            
Balance (21,334) (21,572) (17,826) (17,859) (21,572) (17,859)
Foreign currency translation adjustments 100 130 (711) (85)    
Pension liability adjustment, net of tax 123 108 118 118    
Balance $ (21,111) $ (21,334) (18,419) (17,826) $ (21,111) (18,419)
Noncontrolling Interest [Member]            
Balance     6,829 7,122   7,122
Net earnings     (103) (171)    
Foreign currency translation adjustments     (280) (34)    
Cash dividends paid to noncontrolling interest       (88)    
Balance     $ 6,446 $ 6,829   $ 6,446