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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% |

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