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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value of Financial Instruments (Textual) [Abstract]    
Business acquisition obligations (Notes 6 and 9) $ 3,992 $ 3,759
Bank Loan Obligations [Member]    
Fair Value of Financial Instruments (Textual) [Abstract]    
Fair value of long term debt 17,600 13,600
Business Acquisition Obligations [Member]    
Fair Value of Financial Instruments (Textual) [Abstract]    
Business acquisition obligations (Notes 6 and 9) $ 4,000 $ 8,900