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Loan Agreement Quarterly Financial Covenants (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Required Minimum Value [Member]  
Schedule of minimum EBITDA level achievable on quarterly basis  
MinTangibleNetWorth $ 45,000
Actual Value [Member]  
Schedule of minimum EBITDA level achievable on quarterly basis  
MinTangibleNetWorth $ 48,570
Maximum | Required Minimum Value [Member]  
Line of Credit Facility [Line Items]  
EBITDA to Fixed Charges 1.10
Maximum | Actual Value [Member]  
Line of Credit Facility [Line Items]  
EBITDA to Fixed Charges 3.33
Minimum | Required Minimum Value [Member]  
Line of Credit Facility [Line Items]  
EBITDA to Fixed Charges 1.00
Minimum | Actual Value [Member]  
Line of Credit Facility [Line Items]  
EBITDA to Fixed Charges 1.00