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Subsequent Events (Details) - USD ($)
1 Months Ended
Aug. 03, 2018
Apr. 30, 2018
Feb. 28, 2018
Jun. 30, 2018
Dec. 31, 2017
Subsequent Event [Line Items]          
Credit Facility       $ 0 $ 0
Line of Credit [Member]          
Subsequent Event [Line Items]          
Credit Facility       $ 0 $ 0
Line of Credit [Member] | Subsequent Event          
Subsequent Event [Line Items]          
Credit Facility $ 136,000,000        
Secured notes | Notes Payable Maturities 2018          
Subsequent Event [Line Items]          
Repayments of secured mortgages   $ 13,380,000 $ 11,038,000    
Secured notes | Notes Payable Maturities 2018 | Subsequent Event          
Subsequent Event [Line Items]          
Repayments of secured mortgages $ 51,449,000