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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Long-term debt (in thousands)

    June 30,   December 31,
    2019   2018
Riverfront permanent loan   $ 88,857       88,789  
Less portion due within one year     —         —    
    $ 88,857       88,789