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Discontinued Operations (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Oct. 17, 2018
Jul. 01, 2018
Jul. 02, 2017
Sep. 30, 2018
Oct. 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale   $ 4,000,000 $ 68,448,000    
Post-closing adjustments     1,448,000    
Gain on divestiture of business, net   0     $ 11,413,000
Cash provided by (used in) operating activities of discontinued operations       $ (562,000) (5,437,000)
Cash provided by (used in) investing activities related to discontinued operations       $ 6,134,000 63,199,000
Original lease agreement [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Term of lease       10 years  
Amended lease agreement [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Term of lease       14 years  
Lease renewal period       3 years  
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   $ 0 $ 11,413,000   $ 11,413,000
Discontinued Operations Held-for-sale [Member] | Original lease agreement [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Total annual lease payments       $ 1,288,000  
Discontinued Operations Held-for-sale [Member] | Current twelve month estimate [Member] | Amended lease agreement [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Total annual lease payments       $ 1,755,000  
Subsequent Event [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale $ 10,636,000        
Minimum [Member] | Amended lease agreement [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Early termination term       5 years  
Maximum [Member] | Amended lease agreement [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Early termination term       10 years