EQUITY AND NONCONTROLLING INTEREST - Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Numerator:
Income from continuing operations, net of income taxes	$ 52,850	$ 54,673	$ 106,118	$ 101,636
Income (loss) from discontinued operations, net of income taxes	1,529	(71)	1,506	(75)
Less: Net income attributable to noncontrolling interests	670	650	1,284	831
Net income attributable to common shareholders	$ 53,709	$ 53,952	$ 106,340	$ 100,730
Denominator:
Weighted-average shares outstanding—Basic (in shares)	48,198	47,591	47,992	47,569
Effect of dilutive securities:
Stock options, restricted stock units, performance share units and restricted stock (in shares)	845	751	974	835
Weighted-average shares outstanding—Diluted (in shares)	49,043	48,342	48,966	48,404

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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