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Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Debt $ 158,584,000   $ 155,966,000  
Interest expense 2,900,000 $ 2,600,000    
Interest costs capitalized 2,900,000 $ 2,600,000    
Restricted net assets 129,500,000      
Real estate operations        
Debt Instrument [Line Items]        
Line of credit 239,200,000   232,600,000  
Line of Credit | Real estate operations        
Debt Instrument [Line Items]        
Unused capacity $ 79,400,000   $ 75,100,000  
Mortgage debt        
Debt Instrument [Line Items]        
Weighted average interest rate 6.40%   6.40%  
No stated interest, payments through 2017 | Mortgage debt        
Debt Instrument [Line Items]        
Stated interest rate (percent) 0.00%      
Mortgages   $ 1,935,000  
3% to 4.75% payments through 2017 | Mortgage debt        
Debt Instrument [Line Items]        
Mortgages $ 69,928,000   67,336,000  
3% to 4.75% payments through 2017 | Mortgage debt | Minimum        
Debt Instrument [Line Items]        
Stated interest rate (percent) 3.00%      
3% to 4.75% payments through 2017 | Mortgage debt | Maximum        
Debt Instrument [Line Items]        
Stated interest rate (percent) 4.75%      
5% to 5.5% payments through 2016 | Mortgage debt        
Debt Instrument [Line Items]        
Mortgages $ 9,381,000   7,636,000  
5% to 5.5% payments through 2016 | Mortgage debt | Minimum        
Debt Instrument [Line Items]        
Stated interest rate (percent) 5.00%      
5% to 5.5% payments through 2016 | Mortgage debt | Maximum        
Debt Instrument [Line Items]        
Stated interest rate (percent) 5.50%      
8% payments through 2018 | Mortgage debt        
Debt Instrument [Line Items]        
Stated interest rate (percent) 8.00%      
Mortgages $ 3,977,000   3,975,000  
8.5% Senior Notes Due in 2017 | Senior Notes        
Debt Instrument [Line Items]        
Debt issued       $ 75,000,000
8.5% Senior Notes Due in 2017 | Mortgage debt        
Debt Instrument [Line Items]        
Stated interest rate (percent) 8.50%      
8.5% Senior Notes Due in 2017 | UCP | Senior Notes        
Debt Instrument [Line Items]        
Maximum debt to tangible assets ratio allowed per covenant (percent) 45.00%      
Maximum secured debt allowed per covenant $ 75,000,000      
Maximum secured debt to tangible assets ratio allowed per covenant (percent) 30.00%      
Maximum annual acquisition of unimproved real property allowed per covenant $ 75,000,000      
Maximum acquisition of unimproved real property allowed per covenant over the term of debt agreement $ 150,000,000      
10% payments through 2017 | Mortgage debt        
Debt Instrument [Line Items]        
Stated interest rate (percent) 10.00%      
Mortgages $ 1,604,000   $ 1,604,000