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Debt (Details) - USD ($)
9 Months Ended
Jun. 05, 2018
Sep. 30, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]      
Borrowings of line of credit   $ 6,965,000 $ 950,000
Collateralized Mortgage Backed Loan | Secured Debt      
Line of Credit Facility [Line Items]      
Long-term debt   $ 200,000 $ 400,000
Fixed interest rate   4.00%  
Revolving Loans | Citizens Bank, N.A.      
Line of Credit Facility [Line Items]      
Revolving loans, aggregate principal amount $ 25,000,000.0 $ 25,000,000  
Revolving loans, accordion option 15,000,000.0    
Revolving loans, accordion option, borrowing increments $ 5,000,000    
Credit Facility maturity term 3 years    
Amount available under Credit Facility   $ 18,000,000  
Revolving Loans | Citizens Bank, N.A. | LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   1.50%