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Discontinued Operations (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 02, 2017
Jul. 02, 2017
Jul. 03, 2016
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale   $ 68,448    
Post-closing adjustments   1,448    
Gain on divestiture of business, net   11,413    
Cash provided by (used in) operating activities of discontinued operations   (5,625) $ 2,507  
Cash provided by (used in) investing activities related to discontinued operations   $ 62,036 $ (487)  
Term of lease   10 years    
Early termination term   5 years    
Scenario, Forecast [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale       $ 4,000
Discontinued Operations Held-for-sale [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on divestiture of business, net $ 709 $ 11,413    
Discontinued Operations Held-for-sale [Member] | Scenario, Forecast [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Total annual lease payments       $ 1,288