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Acquisitions (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Acquisition Of Noncontrolling Interest   $ 19,100  
Assets Held-for-sale, Not Part of Disposal Group   37,800  
Liabilities for sale   19,172 $ 0
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down   $ 900  
Subsequent Event [Member]      
Business Acquisition [Line Items]      
Proceeds from Divestiture of Businesses $ 2,800