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EQUITY AND LONG-TERM INCENTIVE COMPENSATION (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Income Per Share
Weighted-average number of common shares used in basic income per share	43,080	42,540	42,948	42,347
Dilutive securities — Employee stock options, restricted stock shares and restricted stock units (in shares)	1,824	1,524	1,700	1,381
Weighted-average number of common shares and dilutive securities used in diluted income per share	44,904	44,064	44,648	43,728
Restricted stock shares/units
Stock-based Compensation
Number of options or units that were excluded from the computation of diluted income per share	252		286
Stock options
Stock-based Compensation
Number of options or units that were excluded from the computation of diluted income per share	859		871
Restricted Stock And Restricted Stock Units Excluded from Computation of Diluted Income Per Share Due to Net Loss
Stock-based Compensation
Number of options or units that were excluded from the computation of diluted income per share		452		534
Employee Stock Options Excluded from Computation of Diluted Income Per Share Due to Net Loss
Stock-based Compensation
Number of options or units that were excluded from the computation of diluted income per share		961		1,009

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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