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STOCKHOLDERS' DEFICIENCY (Tables)
12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Schedule of Common and Treasury Stock Issued and/or Outstanding
Information about the Company's common and treasury stock issued and/or outstanding is presented in the following table:
Class A Common StockTreasury Stock
Balance, January 1, 201955,556,466 1,533,320 
    Restricted stock grants (a)
1,163,538 — 
    Restricted stock forfeitures(249,514)— 
 Withholding of restricted stock to satisfy taxes— 92,260 
Balance, December 31, 201956,470,490 1,625,580 
    Restricted stock grants (a)
1,065,319 — 
    Restricted stock forfeitures (793,296)— 
    Withholding of restricted stock to satisfy taxes— 148,620 
Balance, December 31, 202056,742,513 1,774,200 
(a) The 2019 and 2020 grants include 67,214 and nil restricted stock awards, respectively, and 1,096,324 and 1,065,319 RSUs, respectively, the latter granted pursuant to the 2019 TIP and LTIP programs under the Stock Plan. See Note 12., "Stock Compensation Plan," for further discussion of the Company's Stock Plan.