Annual report pursuant to Section 13 and 15(d)

Borrowings Borrowings - Farm Credit Notes Payable (Narrative) (Details)

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Borrowings Borrowings - Farm Credit Notes Payable (Narrative) (Details)
$ in Thousands
12 Months Ended
Nov. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]        
Repayments on mortgage note payable   $ (7,906) $ (4,827) $ (626)
Debt instrument, fee amount   276    
Debt issuance costs, gross   $ 306    
Farm Credit Notes Payable        
Debt Instrument [Line Items]        
Debt Instrument, loans to value ratios percentage   60.00%    
Mortgage notes payable | Farm Credit Notes Payable        
Debt Instrument [Line Items]        
Number of collateralized properties   22    
Book value of collateralized asset   $ 95,600    
Hillsborough, FL        
Debt Instrument [Line Items]        
Repayments on mortgage note payable $ (2,600)      
Interest rate (as percent) 2.90%