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NON-CONTROLLING INTERESTS NON-CONTROLLING INTERESTS - Redemption of LLC Interests (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 25, 2020
Limited Liability Company
Class of Stock [Line Items]
Number of units redeemed (in shares)	29,600	28,195
Redemptions by NCI Holders | Limited Liability Company
Class of Stock [Line Items]
Number of units redeemed (in shares)	29,600	28,195
Common Stock [Member] | Class A Common Stock
Class of Stock [Line Items]
Shares of Class A common stock issued in connection with redemptions of LLC Interests	29,600	28,195
Common Stock [Member] | Class B Common Stock
Class of Stock [Line Items]
Shares of Class A common stock issued in connection with redemptions of LLC Interests	29,600	28,195
Shares of Class B common stock surrendered and canceled	29,600	28,195

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The number of units redeemed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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Number of shares that have been repurchased and retired during the period.

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