STOCKHOLDERS' DEFICIENCY - Common and Treasury Stock Issued and/or Outstanding (Details) - shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Withholding of restricted stock to satisfy taxes		89,620
Common Stock \| Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	54,556,100	53,956,073
Restricted stock grants		853,111
Restricted stock forfeitures		(253,084)
Ending balance	55,556,466	54,556,100
Awards granted (in shares)	1,303,883
Awards forfeited (in shares)	303,517
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,114,528	1,024,908
Withholding of restricted stock to satisfy taxes	167,297	89,620
Restricted stock forfeitures	251,495
Ending balance	1,533,320	1,114,528
Restricted Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Withholding of restricted stock to satisfy taxes	167,297	89,620
Restricted Stock \| Stock Plan
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock forfeitures	251,495
Awards granted (in shares)	69,767
Restricted Stock \| LTP Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Awards granted (in shares)		853,111
Restricted Stock Units \| LTP Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Awards granted (in shares)	1,234,116
Awards forfeited (in shares)	52,022

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 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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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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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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