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Debt - Hawaii Retail Credit Facilities (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 21, 2017 | Dec. 31, 2017 | Dec. 21, 2017 | Dec. 17, 2015
Hawaii Retail Credit Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate during period |  | 4.00% |  |
Hawaii Retail Credit Agreement | Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line credit maximum borrowing amount |  |  |  | $ 110,000,000
Annual principal payment | $ 2,750,000 |  | $ 2,750,000 |
Hawaii Retail Credit Agreement | Revolving Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line credit maximum borrowing amount |  |  |  | $ 5,000,000
Cost associated with termination of debt | $ 1,200,000 |  |  |
Base Rate | Minimum | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument margin rate |  |  | 1.50% |
Base Rate | Maximum | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument margin rate |  |  | 2.25% |
Eurodollar | Minimum | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument margin rate |  |  | 2.50% |
Eurodollar | Maximum | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument margin rate |  |  | 3.25% |

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