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Notes Payable and Revolving Line of Credit (Narrative) (Details)
1 Months Ended 9 Months Ended
Jul. 31, 2015
USD ($)
Apr. 30, 2015
USD ($)
Feb. 28, 2015
USD ($)
May. 31, 2014
USD ($)
Sep. 30, 2015
USD ($)
loan
Jul. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Oct. 21, 2014
USD ($)
Debt Instrument [Line Items]                
Line of credit facility, outstanding amount         $ 100,000,000   $ 20,000,000  
Land development notes, outstanding         3,528,000   5,737,000  
Insurance premium notes, outstanding         $ 1,021,000   $ 5,135,000  
Minimum                
Debt Instrument [Line Items]                
Discount rate         5.10%      
Maximum                
Debt Instrument [Line Items]                
Discount rate         6.30%      
First Modification Agreement [Member] | Texas Capital Bank [Member]                
Debt Instrument [Line Items]                
Maturity date Oct. 21, 2017              
Extended maturity date Oct. 21, 2018              
Line of credit facility. maximum borrowing capacity $ 200,000,000         $ 120,000,000    
First Modification Agreement [Member] | Bank of America [Member]                
Debt Instrument [Line Items]                
Uncommitted option to increase credit facility $ 100,000,000              
Initial Senior Notes [Member]                
Debt Instrument [Line Items]                
Principal amount       $ 200,000,000        
Net proceeds from issuance of senior debt       $ 193,300,000        
Interest rate       6.875%        
Discount rate       99.239%        
Maturity year       2022        
Exchange Notes [Member]                
Debt Instrument [Line Items]                
Principal amount     $ 200,000,000          
Interest rate     6.875%          
Maturity year     2022          
Additional Senior Notes [Member]                
Debt Instrument [Line Items]                
Principal amount   $ 60,000,000            
Net proceeds from issuance of senior debt   $ 58,500,000            
Interest rate   6.875%            
Discount rate   98.26%            
Maturity year   2022            
Land Development Notes [Member]                
Debt Instrument [Line Items]                
Number of notes payable | loan         4      
Land Development Notes [Member] | Minimum                
Debt Instrument [Line Items]                
Maturity start date         Oct. 01, 2015      
Interest only payment percentage         0.50%      
Land Development Notes [Member] | Maximum                
Debt Instrument [Line Items]                
Maturity end date         Apr. 01, 2016      
Interest only payment percentage         5.00%      
Insurance Premium Note [Member]                
Debt Instrument [Line Items]                
Number of notes payable | loan         4      
Insurance Premium Note [Member] | Minimum                
Debt Instrument [Line Items]                
Maturity start date         Nov. 01, 2015      
Insurance Premium Note [Member] | Maximum                
Debt Instrument [Line Items]                
Interest rate         3.89%      
Maturity end date         Mar. 01, 2016      
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of credit facility. maximum borrowing capacity               $ 120,000,000
Line of credit facility, outstanding amount         $ 100,000,000      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate         2.75%      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) | Maximum                
Debt Instrument [Line Items]                
Basis spread on variable rate         3.25%      
Revolving Credit Facility [Member] | Base Rate [Member]                
Debt Instrument [Line Items]                
Line of credit facility, interest rate         2.95%      
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate         1.75%      
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum                
Debt Instrument [Line Items]                
Basis spread on variable rate         2.25%      
Line Of Credit [Member]                
Debt Instrument [Line Items]                
Line of credit facility. maximum borrowing capacity               $ 20,000,000