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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Director
Employee
Common Stock
Common Stock
Director
Common Stock
Employee
Paid-in capital
Paid-in capital
Director
Paid-in capital
Employee
Retained earnings
Retained earnings
Director
Retained earnings
Employee
Accumulated other comprehensive loss
Accumulated other comprehensive loss
Director
Accumulated other comprehensive loss
Employee
Beginning Balance (in shares) at Dec. 31, 2015       14,030,000                      
Balance at beginning of year at Dec. 31, 2015 $ 199,468     $ 140     $ 165,780     $ 47,733     $ (14,185)    
Comprehensive (loss) income:                              
Net income (loss) 15,720             15,720        
Translation adjustment (22,683)                 (22,683)    
Derivative fair value adjustment 17                 17    
Effect of retirement benefit obligations (148)                 (148)    
Comprehensive (loss) income (7,094)                            
Restricted shares issued to directors (in shares)         27,000                    
Restricted shares issued to directors                    
Shares issued to employees/directors (in shares)           234,000                  
Shares issued to employees/directors     $ 2,127     $ 3     $ 2,124        
Stock compensation expense 2,911         2,911            
Excess tax benefit from stock options, net $ 435         435            
Exercise of stock options (in shares) 272,325     265,000                      
Exercise of stock options $ 2,353     $ 3     2,350            
Dividends [1] (2,472)             (2,472)        
Ending Balance (in shares) at Dec. 31, 2016       14,556,000                      
Balance at end of year at Dec. 31, 2016 197,728     $ 146     173,600     60,981     (36,999)    
Comprehensive (loss) income:                              
Net income (loss) 2,154             2,154        
Translation adjustment 7,823                 7,823    
Derivative fair value adjustment 17                 17    
Effect of retirement benefit obligations (166)                 (166)    
Comprehensive (loss) income 9,828                            
Restricted shares issued to directors (in shares)         30,000                    
Restricted shares issued to directors                    
Shares issued to employees/directors (in shares)           97,000                  
Shares issued to employees/directors     2     $ 1     1        
Stock compensation expense $ 3,390         3,390            
Exercise of stock options (in shares) 300,000     254,000                      
Exercise of stock options $ 2,537     $ 2     2,535            
Shares effectively repurchased for required employee withholding taxes (in shares)       (34,000)                      
Shares effectively repurchased for required employee withholding taxes (694)         (694)            
Adoption of ASU 2016-09 31         77     (46)        
Dividends [1] (2,543)             (2,543)        
Ending Balance (in shares) at Dec. 31, 2017       14,903,000                      
Balance at end of year at Dec. 31, 2017 210,279     $ 149     178,909     60,546     (29,325)    
Comprehensive (loss) income:                              
Net income (loss) (1,720)             (1,720)        
Translation adjustment (5,906)                 (5,906)    
Derivative fair value adjustment 147                 147    
Effect of retirement benefit obligations 468                 468    
Comprehensive (loss) income $ (7,011)                            
Restricted shares issued to directors (in shares)         46,000                    
Restricted shares issued to directors                    
Shares issued to employees/directors (in shares)           211,000                  
Shares issued to employees/directors         $ 2     $ (2)        
Issuance of 5,593,116 shares of common stock for acquisition of Filament, net of equity issuance costs (in shares) 5,593,116     5,593,000                      
Issuance of 5,593,116 shares of common stock for acquisition of Filament, net of equity issuance costs $ 75,970     $ 56     75,914            
Stock compensation expense $ 4,091         4,091            
Exercise of stock options (in shares) 58,000     58,000                      
Exercise of stock options $ 286     $ 1     285            
Shares effectively repurchased for required employee withholding taxes (in shares)       (47,000)                      
Shares effectively repurchased for required employee withholding taxes (560)         (560)            
Dividends [1] (3,562)             (3,562)        
Ending Balance (in shares) at Dec. 31, 2018       20,764,000                      
Balance at end of year at Dec. 31, 2018 $ 279,493     $ 208     $ 258,637     $ 55,264     $ (34,616)    
[1] Cash dividend declared per share of common stock, were $0.17, $0.17 and $0.17 in 2016, 2017 and 2018, respectively.