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SEGMENT INFORMATION - Disaggregation of Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue $ 585,295 $ 464,232 $ 1,664,566 $ 1,379,124
U.S.        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 336,811 238,226 919,807 714,460
Europe        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 159,473 141,967 481,955 418,468
Canada        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 53,665 51,864 153,802 152,293
Asia Pacific        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 34,062 31,953 104,817 93,094
Other        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue $ 1,284 $ 222 $ 4,185 $ 809