STOCKHOLDERS' DEFICIENCY - Common and Treasury Stock Issued and/or Outstanding (Details) - shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Common Stock \| Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	55,556,466	54,556,100
Stock Granted		1,303,883
Stock forfeited		(303,517)
Ending balance	56,470,490	55,556,466
Awards granted (in shares)	1,163,538
Awards forfeited (in shares)	249,514
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,533,320	1,114,528
Restricted stock forfeitures		251,495
Shares withheld for withholding taxes (in shares)	92,260	167,297
Ending balance	1,625,580	1,533,320
Restricted Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares withheld for withholding taxes (in shares)		167,297
Restricted Stock \| Stock Plan
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock forfeitures		251,495
Awards granted (in shares)	67,214	69,767
Restricted Stock \| LTP Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Awards granted (in shares)		69,767
Awards forfeited (in shares)		251,495
Restricted Stock Units \| LTP Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Awards granted (in shares)	1,096,324	1,234,116
Awards forfeited (in shares)		52,022

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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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Number of shares that have been repurchased during the period and are being held in treasury.

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