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BUSINESS ACQUISITIONS AND DIVESTITURE - WIL Laboratories, Pro Forma Financial Information (Details) - WIL Research - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Business Acquisition [Line Items]    
Revenue $ 1,741,964 $ 1,578,133
Net income attributable to common shareholders $ 175,779 $ 153,974
Earnings (loss) per common share    
Basic (in dollars per share) $ 3.74 $ 3.31
Diluted (in dollars per share) $ 3.67 $ 3.23