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BUSINESS ACQUISITIONS AND DIVESTITURE - MPI Research Pro Forma Information (Details) - MPI Research - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Revenue	$ 585,295	$ 523,948	$ 1,726,683	$ 1,555,146
Net income attributable to common shareholders	$ 59,297	$ 48,927	$ 168,872	$ 139,258
Earnings per common share
Basic (in dollars per share)	$ 1.23	$ 1.03	$ 3.51	$ 2.93
Diluted (in dollars per share)	$ 1.20	$ 1.01	$ 3.44	$ 2.87

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