Discontinued Operations And Sales of Assets (Details)
$ in Thousands
12 Months Ended
Dec. 27, 2016
USD ($)
Dec. 22, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
a
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net proceeds from sale of land and building     $ 5,636 $ 5,866 $ 10,085
Gain (loss) on sale or disposition of assets     $ 1,950 (478) 2,787
Providence, Rhode Island          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net proceeds from sale of land and building   $ 921      
Gain (loss) on sale or disposition of assets   (216)      
Note receivable   $ 1,000      
Notes Receivable Term     3 years    
Dallas, Texas [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net proceeds from sale of land and building $ 4,458       6,677
Gain (loss) on sale or disposition of assets $ 1,842       $ 1,827
Area of land sold | a         97
Riverside, California And Dallas, Texas [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net proceeds from sale of land and building         $ 3,408
Gain (loss) on sale or disposition of assets         862
Providence Journal | Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Purchase price         46,000
Working capital adjustment         2,654
Closing costs         110
Selling expense         3,237
Purchase price and working capital adjustment         $ 17,104
Land and Building Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net proceeds from sale of land and building       6,119  
Gain (loss) on sale or disposition of assets       (265)  
Escrow deposit returned     $ 328    
Building Demolition          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain (loss) on sale or disposition of assets       $ (251)