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Derivatives - AOCI Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ 284,279 $ 267,945 $ 265,459
Gain (loss) recognized in AOCI 67 241 563
Ending balance 332,504 284,279 $ 267,945
Derivatives Designated as Hedging Instruments | Cash Flow Hedging      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 12    
Loss reclassified to earnings 84    
Gain (loss) recognized in AOCI (17)    
Ending balance 79 12  
Derivatives Designated as Hedging Instruments | Cash Flow Hedging | Interest rate swap agreements      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 40    
Loss reclassified to earnings 20    
Gain (loss) recognized in AOCI 19    
Ending balance 79 40  
Derivatives Designated as Hedging Instruments | Cash Flow Hedging | Forward Currency-Exchange Contracts      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (28)    
Loss reclassified to earnings 64    
Gain (loss) recognized in AOCI (36)    
Ending balance $ 0 $ (28)