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Long-Term Debt (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Long-term debt (in thousands)
    September 30,   December 31,
    2020   2019
Riverfront permanent loan   $ 89,027       88,925  
Less portion due within one year     —         —    
    $ 89,027       88,925