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RELATED-PARTY TRANSACTIONS - Current Related Party Indemnification Costs and SECT Transactions (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Dec. 28, 2017	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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
Special Committee Investigation Indemnification | Director | Halle J. Benett
Related Party Transaction [Line Items]
Expenses from transactions with related parties		$ 147	$ 854
Special Committee Investigation Indemnification | Director | Jonah F. Schnel
Related Party Transaction [Line Items]
Expenses from transactions with related parties			854
Special Committee Investigation Indemnification | Director | Robert Sznewajs
Related Party Transaction [Line Items]
Expenses from transactions with related parties			854
Special Committee Investigation Indemnification | General Counsel
Related Party Transaction [Line Items]
Expenses from transactions with related parties				$ 501
Special Committee Investigation Indemnification | General Counsel | Emeritus John Grosvenor
Related Party Transaction [Line Items]
Expenses from transactions with related parties			$ 415

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