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Discontinued Operations (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale $ 4,000     $ 68,448
Gain on divestiture, net $ 0     11,413
Cash provided by (used in) operating activities of discontinued operations   $ (1,052) $ (636) (5,447)
Cash provided by (used in) investing activities related to discontinued operations   $ 3,107 $ 6,290 $ 61,891
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    
Assets 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    
Assets 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   $ 1,832    
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