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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     $ 205,659  
Net earnings $ 1,523 $ 1,303 4,339 $ 3,418
Foreign currency translation adjustments (991) $ 533 (1,110) $ 1,220
Pension liability adjustment, net of tax     (236)  
Balance, June 30, 2018 202,036   202,036  
Common Stock [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     10,162  
Net earnings     0  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     0  
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price     197  
Issuance of restricted stock     2  
Restricted stock forfeited     (2)  
Stock-based compensation expense     0  
Shares purchased and retired     (199)  
Balance, June 30, 2018 10,160   10,160  
Capital in Excess of Par Value [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     55,884  
Net earnings     0  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     0  
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price     3,239  
Issuance of restricted stock     (2)  
Restricted stock forfeited     2  
Stock-based compensation expense     805  
Shares purchased and retired     0  
Balance, June 30, 2018 59,928   59,928  
Reinvested Earnings [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     150,350  
Net earnings     4,613  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     (4,652)  
Cash dividends paid to noncontrolling interest     0  
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price     0  
Issuance of restricted stock     0  
Restricted stock forfeited     0  
Stock-based compensation expense     0  
Shares purchased and retired     (6,390)  
Balance, June 30, 2018 143,921   143,921  
Accumulated Other Comprehensive Loss [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     (17,859)  
Foreign currency translation adjustments     (796)  
Pension liability adjustment, net of tax     236  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     0  
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price     0  
Issuance of restricted stock     0  
Restricted stock forfeited     0  
Stock-based compensation expense     0  
Shares purchased and retired     0  
Balance, June 30, 2018 (18,419)   (18,419)  
Noncontrolling Interest [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     7,122  
Net earnings     (274)  
Foreign currency translation adjustments     (314)  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     (88)  
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price     0  
Issuance of restricted stock     0  
Restricted stock forfeited     0  
Stock-based compensation expense     0  
Shares purchased and retired     0  
Balance, June 30, 2018 $ 6,446   $ 6,446