STOCKHOLDERS' DEFICIENCY - Common and Treasury Stock Issued and/or Outstanding (Details) - shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Restricted Stock \| Stock Plan
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Awards granted	0	67,214
Restricted Stock Units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Awards granted	1,065,319	1,096,324
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,625,580	1,533,320
Withholding of restricted stock to satisfy taxes	148,620	92,260
Ending balance	1,774,200	1,625,580
Class A Common Stock \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	56,470,490	55,556,466
Restricted stock grants	1,065,319	1,163,538
Restricted stock forfeitures	(793,296)	(249,514)
Ending balance	56,742,513	56,470,490

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of shares issued which are neither cancelled nor held in the treasury.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Number of shares related to Restricted Stock Award forfeited during the period.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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