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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Long-term debt (in thousands)

    June 30,   December 31,
    2018   2017
5.6% to 8% mortgage notes                
  due in installments through 2027   —         29,664  
Riverfront permanent loan   $ 88,720       88,653  
      88,720       118,317  
Less portion due within one year     —         4,463  
    $ 88,720       113,854