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Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Long-term debt (in thousands)

    March 31,   December 31,
    2017   2017
5.6% to 8% mortgage notes                
  due in installments through 2027   28,545       29,664  
Riverfront permanent loan     88,686       88,653  
      117,231       118,317  
Less portion due within one year     4,248       4,463  
    $ 112,983       113,854