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Commitments and Contingencies (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2011
Sep. 30, 1999
Commitments and Contingencies              
Provision for contingent obligation $ 11,000 $ 70,000 $ 52,000 $ 56,000      
Provision for contingent obligation at period end 1,854,000   1,854,000   $ 1,802,000    
Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Balance available in the sales and incremental property tax fund 2,549,000   2,549,000   1,761,000    
Amount paid into the sales and incremental property tax fund         982,000    
Deduction from the sales and incremental property tax fund for principal and interest payments         $ 1,197,000    
Nontaxable Municipal Bonds | Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Irrevocable direct-pay letter of credit issued 16,573,000   16,573,000        
Nontaxable Municipal Bonds | Nashville Superspeedway              
Commitments and Contingencies              
Provision for contingent obligation           $ 2,250,000  
Increased in the provision for contingent obligation due to changing interest rates 11,000 $ 70,000 52,000 $ 56,000      
Provision for contingent obligation at period end 1,854,000   1,854,000        
Sports Authority of the County of Wilson (Tennessee) | Nontaxable Municipal Bonds | Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Aggregate principal amount             $ 25,900,000
Outstanding amount of debt 16,300,000   16,300,000        
Sports Authority of the County of Wilson (Tennessee) | Nontaxable Municipal Bonds | Minimum | Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Range of annual principal payments, from September 2017 to 2029 900,000   900,000        
Sports Authority of the County of Wilson (Tennessee) | Nontaxable Municipal Bonds | Maximum | Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Range of annual principal payments, from September 2017 to 2029 $ 1,600,000   $ 1,600,000