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Derivatives - Activity in Accumulated Other Comprehensive Items (OCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 $ 284,279 $ 267,945
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 295,290 $ 277,603
Net unrealized loss included in OCI expected to be reclassified to earnings over the next 12 months 21  
Cash Flow Hedging [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 12  
Loss reclassified to earnings 15  
Gain recognized in AOCI 12  
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 39  
Cash Flow Hedging [Member] | Interest Rate Swap Agreement [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 40  
Loss reclassified to earnings 8  
Gain recognized in AOCI 4  
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 52  
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 (28)  
Loss reclassified to earnings 7  
Gain recognized in AOCI 8  
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 $ (13)