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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - PSU's, RSU's (Details) - Performance Stock Units and Restricted Stock Units $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 30, 2019 USD ($) $ / shares shares
Unvested PSU’s and RSU’s,
Outstanding at beginning of period (in shares) | shares	652
Granted (in shares) | shares	394
Vested (in shares) | shares	(430)
Forfeited (in shares) | shares	(2)
Outstanding at end of period (in shares) | shares	614
Weighted-Average Grant-Date Fair Value Per Share
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 24.65
Granted (in dollars per share) | $ / shares	40.47
Vested (in dollars per share) | $ / shares	18.26
Forfeited (in dollars per share) | $ / shares	35.19
Outstanding at end of period (in dollars per share) | $ / shares	$ 36.15
Unrecognized compensation cost | $	$ 16.3
Weighted average period for recognition	1 year 9 months 18 days

X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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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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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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 vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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