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Notes Payable - Summary of Notes Payable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instruments [Abstract]    
Payments/Long term debt, Total $ 39,836 $ 60,772
Less current portion (1,434) (4,044)
Long term portion 38,402 56,728
Credit Facility [Member]    
Debt Instruments [Abstract]    
Payments/Long term debt, Total $ 38,000 54,000
Average effective interest rate 4.10%  
3.25% through 5.0% Notes Payable due in Next Year [Member]    
Debt Instruments [Abstract]    
Payments/Long term debt, Total $ 1,836 $ 6,772
Annual installments $ 1,434  
3.25% through 5.0% Notes Payable due in Next Year [Member] | Maximum [Member]    
Debt Instruments [Abstract]    
Percentage of interest accrued 5.00%  
3.25% through 5.0% Notes Payable due in Next Year [Member] | Minimum [Member]    
Debt Instruments [Abstract]    
Percentage of interest accrued 3.25%