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Long-Term Debt (Details) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Debt Disclosure [Line Items]    
Line of Credit Facility, Potential Additional Borrowing Capacity $ 3,000,000  
Senior secured revolving credit line 722,987 $ 725,500
Other Long-term Debt 205 213
Total debt 728,605 732,126
Less: Current maturities of long-term debt 4,860 5,883
Long-term debt 723,745 726,243
Line of Credit Facility, Outstanding Amount, USD Borrowings 681,000  
Line of Credit Facility, Amount Outstanding, GBP Borrowings 42,000  
Foreign    
Debt Disclosure [Line Items]    
Foreign loans $ 5,413 $ 6,413