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Segment Reporting (Depreciation and Amortization by Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Depreciation and amortization $ 49,788 $ 50,782 $ 99,270 $ 100,902
Operating segments [Member] | U.S. segment [Member]        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Depreciation and amortization 38,916 39,993 77,702 79,267
Operating segments [Member] | International segment [Member]        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Depreciation and amortization 6,749 6,714 13,205 13,446
Corporate, non-segment [Member]        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Depreciation and amortization $ 4,123 $ 4,075 $ 8,363 $ 8,189