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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		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Business Acquisition [Line Items]
Revenue	$ 585,297	$ 504,710	$ 1,141,388	$ 1,031,198
Net income attributable to common shareholders	$ 60,161	$ 43,113	$ 109,575	$ 90,968
Earnings per common share
Basic (in dollars per share)	$ 1.25	$ 0.91	$ 2.28	$ 1.91
Diluted (in dollars per share)	$ 1.23	$ 0.89	$ 2.24	$ 1.88

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