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RELATED-PARTY TRANSACTIONS - Current Related Party Indemnification Costs and SECT Transactions (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 28, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 13, 2017
Common Stock | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of shares repurchased (in shares) | 2,500,000 |  |  |  |
Evercore Trust Company |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  | 2,500,000 |
Company ownership percentage maximum threshold |  |  |  |  | 5.00%
Special Committee Investigation Indemnification | Director | Halle J. Benett |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related parties |  | $ 562,000 |  |  |
Special Committee Investigation Indemnification | Director | Jonah F. Schnel |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related parties |  | 562,000 |  |  |
Special Committee Investigation Indemnification | Director | Robert Sznewajs |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related parties |  | $ 562,000 |  |  |
Special Committee Investigation Indemnification | General Counsel |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related parties |  |  | $ 501,000 | $ 0 |

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