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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Long-term debt (in thousands)

    June 30,   December 31,
    2017   2016
Revolving credit (uncollateralized)   $ 6,355       6,665  
5.6% to 7.9% mortgage notes                
  due in installments through 2027     31,907       34,080  
      38,262       40,745  
Less portion due within one year     4,673       4,526  
    $ 33,589       36,219