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Notes Payable - Summary of Notes Payable (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Payments/Long term debt, Total | $ 60,772 | $ 51,823
Less current portion | (4,044) | (1,227)
Long term portion | 56,728 | 50,596
Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Payments/Long term debt, Total | $ 54,000 | 46,000
Average effective interest rate | 3.60% |
3.25 % through 4.25 % notes payable due in next year [Member] |  |
Debt Instrument [Line Items] |  |
Payments/Long term debt, Total | $ 6,772 | $ 5,823
Annual installments | $ 4,044 |
3.25 % through 4.25 % notes payable due in next year [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Percentage of interest accrued | 4.25% |
3.25 % through 4.25 % notes payable due in next year [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Percentage of interest accrued | 3.25% |

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- Definition Amount of the total principal payments made during the annual reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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