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Related Party Transactions Itasca Golf Investors, LLC: (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2015
Jun. 30, 2014
Related Party Transaction [Line Items]          
Proceeds from sale of investee $ 3,470        
Net realized (losses) gains $ (17) $ 306      
Equity Method Investee [Member]          
Related Party Transaction [Line Items]          
Equity Method Investment, Ownership Percentage 47.60%   51.00% 33.30%  
Investor [Member]          
Related Party Transaction [Line Items]          
Equity Method Investment, Ownership Percentage         42.90%
Proceeds from sale of investee $ 1,500        
Net realized (losses) gains $ 400