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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