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Long Term Debt (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2018
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Jan. 22, 2018
Debt Instrument [Line Items]          
Secured Debt   $ 54,319 $ 54,319 $ 60,795  
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000        
Maturity of debt instrument in years and months     5 years    
Debt Instrument, Payment Terms the outstanding term loans began to amortize in equal quarterly installments equal to $0.4 million per quarter on such date and during each of the next three quarters thereafter, $0.6 million per quarter during the next four quarters thereafter and $0.8 million per quarter thereafter, with a balloon payment at maturity.        
Debt Instrument Quarterly Payment Current Year   400 $ 400    
Debt Instrument Quarterly Payment Next Year   600 600    
Debt Instrument Quarterly Payment Thereafter   $ 800 $ 800    
Limitation on pledges of capital stock of foreign subsidiaries   65.00% 65.00%    
Line of Credit Facility, Amount Outstanding         $ 11,900
Line of Credit Facility, Remaining Borrowing Capacity   $ 9,400 $ 9,400    
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000        
Line of Credit Facility, Amount Outstanding $ 4,800        
Revolving Credit Facility [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Description Of Variable Rate Basis a base rate plus 4.75%        
Basis Spread on Variable Rate 4.75%        
Floor Interest Rate 4.25%        
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Description Of Variable Rate Basis London Interbank Offered Rate (LIBOR) rate plus 6.25%        
Basis Spread on Variable Rate 6.25%        
Floor Interest Rate 1.25%        
Term Loan [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 64,000        
Percentage of excess cash flow   50.00% 50.00%    
Interest Rate As Of Reporting Date   8.69% 8.69%    
Excess cash flow [Member]          
Debt Instrument [Line Items]          
Prepayment of senior debt   $ 4,000      
Denville Transaction [Member]          
Debt Instrument [Line Items]          
Prepayment of senior debt     $ 1,000