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Debt (Schedule of Lines of Credit Outstanding) (Details) - Subsidiary of JBGL - Inwood National Bank - USD ($)
Jul. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Oct. 13, 2014
Oct. 13, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]            
Borrowings on lines of credit   $ 13,960,000 $ 14,061,000      
Direct Finance Leases A            
Line of Credit Facility [Line Items]            
Borrowings on lines of credit   0 662,000      
Maximum borrowing capacity           $ 4,800,000
Direct Finance Leases B            
Line of Credit Facility [Line Items]            
Borrowings on lines of credit   0 899,000      
Maximum borrowing capacity           3,000,000
John's Creek            
Line of Credit Facility [Line Items]            
Borrowings on lines of credit   0 12,500,000      
Maximum borrowing capacity         $ 25,000,000 $ 8,000,000
Stated interest rate       4.00%    
Johns' Creek, Carrollton, Allen            
Line of Credit Facility [Line Items]            
Borrowings on lines of credit   $ 13,960,000 $ 0      
Maximum borrowing capacity $ 50,000,000.0          
BorrowingBaseLimitationTotalValueOfland 50.00%          
BorrowingBaseLimitationTotalValueOfLotsOwned 60.00%          
MaximumValueOfLandUsedWhenCalculatingBorrowingBase 50.00%          
Minimum rate on Inwood loan | Direct Finance Leases A            
Line of Credit Facility [Line Items]            
Stated interest rate           4.00%
Minimum rate on Inwood loan | Direct Finance Leases B            
Line of Credit Facility [Line Items]            
Stated interest rate           4.00%
Other Assets | Johns' Creek, Carrollton, Allen            
Line of Credit Facility [Line Items]            
Debt issuance cost $ 400,000          
Minimum | Johns' Creek, Carrollton, Allen            
Line of Credit Facility [Line Items]            
Stated interest rate 4.00%          
Maximum | Johns' Creek, Carrollton, Allen            
Line of Credit Facility [Line Items]            
Stated interest rate 18.00%