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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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