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SEGMENT INFORMATION - Disaggregation of Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue $ 585,301 $ 469,129 $ 1,079,271 $ 914,892
U.S.        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 334,016 244,923 582,996 476,234
Europe        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 161,656 139,620 322,482 276,501
Canada        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 51,559 53,242 100,137 100,429
Asia Pacific        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 36,235 31,046 70,755 61,141
Other        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue $ 1,835 $ 298 $ 2,901 $ 587