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Acquisitions and Dispositions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Dec. 29, 2018
Subsequent Event [Line Items]          
Acquisitions, net of cash acquired     $ 1,431 $ 51,089  
Goodwill $ 1,233,486   1,233,486   $ 1,229,159
Proceeds from sale of investment in subsidiary     0 82,805  
Loss on disposal of subsidiaries $ 0 $ 15,538 $ 0 $ 15,538