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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Jan. 01, 2019
Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance $ 1,772,278 [1] $ 1,730,060    
Other comprehensive income/(loss) 6,048 29,846    
Amounts reclassified from retained earnings to accumulated other comprehensive loss     $ (6,771) $ 1,721
Ending Balance 1,801,139 1,796,456    
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance (251,102) (198,495)    
Other comprehensive income/(loss) before reclassifications (2,852) 22,553    
Other comprehensive income/(loss) (2,852) 22,553    
Ending Balance (253,954) (175,942)    
Defined Benefit Pension Items        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance (487,380) (467,136)    
Other comprehensive income/(loss) before reclassifications (508) (1,145)    
Other comprehensive income/(loss) 7,156 5,817    
Ending Balance (480,224) (461,319)    
Defined Benefit Pension Items | Net Income        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax 7,664 6,962    
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance (2,431) (641)    
Other comprehensive income/(loss) before reclassifications 2,256 1,182    
Other comprehensive income/(loss) 1,864 1,047    
Amounts reclassified from retained earnings to accumulated other comprehensive loss       (176)
Ending Balance (567) 230    
Gains and Losses on Cash Flow Hedges | Fixed Assets        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax (45) (45)    
Gains and Losses on Cash Flow Hedges | Net Income        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax (347) (180)    
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance (740,913) (666,272)    
Other comprehensive income/(loss) before reclassifications (1,104) 22,590    
Other comprehensive income/(loss) 6,168 29,417    
Amounts reclassified from retained earnings to accumulated other comprehensive loss       $ (176)
Ending Balance (734,745) (637,031)    
Accumulated Other Comprehensive Loss | Fixed Assets        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax (45) (45)    
Accumulated Other Comprehensive Loss | Net Income        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax $ 7,317 $ 6,782    
[1] The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.