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Debt (Schedule of Lines of Credit Outstanding) (Details) - USD ($)
12 Months Ended
Sep. 01, 2017
Mar. 06, 2017
May 03, 2016
Dec. 15, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 15, 2017
Oct. 27, 2017
Dec. 15, 2016
Dec. 01, 2016
Aug. 31, 2016
Jul. 30, 2015
Line of Credit Facility [Line Items]                        
Borrowings on lines of credit         $ 107,000,000 $ 75,000,000            
Inwood National Bank | Johns Creek Carrollton Allen                        
Line of Credit Facility [Line Items]                        
Borrowings on lines of credit         $ 32,000,000 15,000,000            
Line of Credit Facility, Interest Rate at Period End         4.50%              
BorrowingBaseLimitationTotalValueOfland     50.00%                  
BorrowingBaseLimitationTotalValueOfLotsOwned     65.00%                  
MaximumValueOfLandUsedWhenCalculatingBorrowingBase     65.00%                  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.25%                  
Subsidiary of JBGL | Inwood National Bank | Johns Creek Carrollton Allen                        
Line of Credit Facility [Line Items]                        
Line of credit, maximum borrowing capacity               $ 75,000,000       $ 50,000,000
Other Assets                        
Line of Credit Facility [Line Items]                        
Payments of Debt Issuance Costs         $ 1,200,000 800,000            
Other Assets | Inwood National Bank | Johns Creek Carrollton Allen                        
Line of Credit Facility [Line Items]                        
Payments of Debt Issuance Costs     $ 100,000                  
Minimum | Subsidiary of JBGL | Inwood National Bank | Johns Creek Carrollton Allen                        
Line of Credit Facility [Line Items]                        
Stated interest rate                       4.00%
Maximum | Subsidiary of JBGL | Inwood National Bank | Johns Creek Carrollton Allen                        
Line of Credit Facility [Line Items]                        
Stated interest rate                       18.00%
Unsecured Debt | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Basis Spread on Variable Rate       1.50%                
Debt Instrument, Interest Rate, Effective Percentage         3.97%              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.45%                
Unrestricted Cash Borrowing Base Limitation       100.00%                
Borrowing Base Limitation for Unrestricted Cash       $ 15,000,000                
Book Value of Model Homes Borrowing Base       85.00%                
Book Value of Finished Lots and Land Under Development       65.00%                
Book Value of Entitled Land       50.00%                
Unsecured Debt | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member] | Unsecured Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Borrowings on lines of credit       $ 40,000,000                
Unsecured Debt | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member] | Unsecured Debt                        
Line of Credit Facility [Line Items]                        
Borrowings on lines of credit         $ 75,000,000 $ 60,000,000            
Unsecured Debt | Flagstar Bank [Member] | Unsecured Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Borrowings on lines of credit $ 70,000,000 $ 35,000,000                 $ 20,000,000  
Unsecured Debt | Credit Suisse AG, Cayman Islands Branch [Member] | Unsecured Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Borrowings on lines of credit 25,000,000     15,000,000                
Unsecured Debt | Citibank, N.A. [Member] | Unsecured Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Borrowings on lines of credit       25,000,000           $ 35,000,000    
Unsecured Debt | Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, and Flagstar Bank | Unsecured Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Borrowings on lines of credit 130,000,000 85,000,000               $ 70,000,000 60,000,000  
Line of credit, maximum borrowing capacity 200,000,000.0                   $ 110,000,000.0  
Payments of Debt Issuance Costs $ 400,000 $ 100,000                    
Upfront fee on extended commitments             0.15%   0.15%      
Unsecured Debt | Maximum | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member] | Unsecured Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Borrowings on lines of credit       $ 75,000,000                
Unsecured Debt | Federal Funds Rate [Domain] | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Basis Spread on Variable Rate       0.50%                
Unsecured Debt | London Interbank Offered Rate (LIBOR) [Member] | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Basis Spread on Variable Rate       1.00%                
Unsecured Debt | London Interbank Offered Rate (LIBOR) [Member] | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Basis Spread on Variable Rate       2.50%