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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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