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Debt (Schedule of Lines of Credit Outstanding) (Details) - USD ($)
$ in Thousands
Aug. 31, 2016
May 03, 2016
Dec. 15, 2015
Jul. 30, 2015
Sep. 30, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]            
Long-term Line of Credit         $ 81,500 $ 47,500
JohnsCreekCarrolltonAllen [Member] | Inwood National Bank [Member]            
Line of Credit Facility [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity   $ 50,000   $ 50,000    
Long-term Line of Credit         $ 21,500 17,500
BorrowingBaseLimitationTotalValueOfland   50.00%   50.00%    
BorrowingBaseLimitationTotalValueOfLotsOwned   65.00%   60.00%    
MaximumValueOfLandUsedWhenCalculatingBorrowingBase   65.00%   50.00%    
Line of Credit Facility, Interest Rate at Period End         4.00%  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.25%        
Other Assets [Member] | JohnsCreekCarrolltonAllen [Member] | Inwood National Bank [Member]            
Line of Credit Facility [Line Items]            
Debt Issuance Cost   $ 100   $ 400    
Minimum [Member] | JohnsCreekCarrolltonAllen [Member] | Inwood National Bank [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       4.00%    
Maximum [Member] | JohnsCreekCarrolltonAllen [Member] | Inwood National Bank [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       18.00%    
Unsecured Debt [Member] | Unsecured Revolving Credit Facility [Member] | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member]            
Line of Credit Facility [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity     $ 75,000      
Long-term Line of Credit     $ 40,000   $ 60,000 $ 30,000
Line of Credit Facility, Interest Rate at Period End         2.90%  
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      
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 [Member] | Unsecured Revolving Credit Facility [Member] | Flagstar Bank [Member]            
Line of Credit Facility [Line Items]            
Long-term Line of Credit $ 20,000          
Unsecured Debt [Member] | Unsecured Revolving Credit Facility [Member] | Citibank, N.A. [Member]            
Line of Credit Facility [Line Items]            
Long-term Line of Credit     $ 25,000      
Unsecured Debt [Member] | Unsecured Revolving Credit Facility [Member] | Credit Suisse AG, Cayman Islands Branch [Member]            
Line of Credit Facility [Line Items]            
Long-term Line of Credit     15,000      
Unsecured Debt [Member] | Unsecured Revolving Credit Facility [Member] | Citibank, N.A., Credit Suisse AG, Cayman Islands Branch,an d Flagstar Bank [Member] [Member]            
Line of Credit Facility [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity 110,000          
Long-term Line of Credit 60,000          
Unsecured Debt [Member] | Other Assets [Member] | Unsecured Revolving Credit Facility [Member] | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member]            
Line of Credit Facility [Line Items]            
Debt Issuance Cost     $ 500      
Unsecured Debt [Member] | Other Assets [Member] | Unsecured Revolving Credit Facility [Member] | Citibank, N.A., Credit Suisse AG, Cayman Islands Branch,an d Flagstar Bank [Member] [Member]            
Line of Credit Facility [Line Items]            
Debt Issuance Cost $ 200          
Unsecured Debt [Member] | Base Rate [Member] | Unsecured Revolving Credit Facility, Base Rate Advances [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     1.50%      
Unsecured Debt [Member] | Federal Funds Effective Swap Rate [Member] | Unsecured Revolving Credit Facility, Base Rate Advances [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     0.50%      
Unsecured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Unsecured Revolving Credit Facility, Base Rate Advances [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 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Unsecured Revolving Credit Facility, Eurodollar Rate Advances [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%