Annual report pursuant to Section 13 and 15(d)

Omaha and Clermont Land Leases (Details)

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Omaha and Clermont Land Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Percentage of annual lease rent 12.50%    
Operating Leases, Rent Expense, Net, Total $ 73 $ 73 $ 80
Clermont Land Lease [Member]      
Lessee Leasing Arrangements, Operating Leases, Renewal Term 75 years