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Debt Obligations (Details)
1 Months Ended
Dec. 31, 2017
Nov. 30, 2014
USD ($)
Apr. 30, 2004
USD ($)
Mar. 31, 2018
USD ($)
Dec. 18, 2017
USD ($)
Nov. 20, 2014
$ / shares
Debt Instrument [Line Items]            
Debt Issuance Costs, Gross         $ 4,100,000  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net       $ 3,900,000    
Proceeds from Convertible Debt   $ 87,500,000        
Convertible Debt Instrument Interest Rate Stated Percentage       0.00%    
Debt Instrument, Convertible, Conversion Ratio   118.4553        
Debt Instrument, Convertible, Conversion Price | $ / shares           $ 8.442
Debt Issuance Cost   $ 3,400,000        
Unamortized Debt Issuance Expense       $ 1,800,000    
Debt Instrument, Fair Value Disclosure       111,900,000    
Buildings Collateral       59,200,000    
Land Collateral       $ 2,700,000    
Debt Instrument, Description 200000000          
Mortgage Loans on Real Estate, New Mortgage Loans     $ 34,000,000      
Debt Instrument, Interest Rate, Stated Percentage       8.23%    
Debt Instrument, Face Amount         $ 150,000,000  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages       $ 13,500,000