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Note Payable - Repayments of Principal (Details) - Senior Credit Facility [Member] - Bank of America, Wells Fargo Bank, and Other Lenders [Member] - USD ($)
Dec. 31, 2017
Oct. 31, 2014
Line of Credit Facility [Line Items]    
2018 $ 22,500,000  
2019 60,000,000  
Total $ 82,500,000 $ 225,000,000.0