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Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]            
Debt $ 162,685,000   $ 162,685,000   $ 155,966,000  
Interest costs capitalized 3,200,000 $ 2,800,000 6,100,000 $ 5,400,000    
Restricted net assets 127,800,000   127,800,000      
Real estate operations            
Debt Instrument [Line Items]            
Line of credit 241,200,000   241,200,000   232,600,000  
Line of Credit | Real estate operations            
Debt Instrument [Line Items]            
Unused capacity $ 77,300,000   $ 77,300,000   $ 75,100,000  
Mortgage debt            
Debt Instrument [Line Items]            
Weighted average interest rate 6.40%   6.40%   6.40%  
No stated interest, payments through 2017 | Mortgage debt            
Debt Instrument [Line Items]            
Stated interest rate (percent) 0.00%   0.00%      
Mortgages     $ 1,935,000  
3% to 4.75% payments through 2017 | Mortgage debt            
Debt Instrument [Line Items]            
Mortgages $ 71,995,000   $ 71,995,000   67,336,000  
3% to 4.75% payments through 2017 | Mortgage debt | Minimum            
Debt Instrument [Line Items]            
Stated interest rate (percent) 3.00%   3.00%      
3% to 4.75% payments through 2017 | Mortgage debt | Maximum            
Debt Instrument [Line Items]            
Stated interest rate (percent) 4.75%   4.75%      
5% to 5.5% payments through 2016 | Mortgage debt            
Debt Instrument [Line Items]            
Mortgages $ 11,198,000   $ 11,198,000   7,636,000  
5% to 5.5% payments through 2016 | Mortgage debt | Minimum            
Debt Instrument [Line Items]            
Stated interest rate (percent) 5.00%   5.00%      
5% to 5.5% payments through 2016 | Mortgage debt | Maximum            
Debt Instrument [Line Items]            
Stated interest rate (percent) 5.50%   5.50%      
8% payments through 2018 | Mortgage debt            
Debt Instrument [Line Items]            
Stated interest rate (percent) 8.00%   8.00%      
Mortgages $ 3,979,000   $ 3,979,000   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%   8.50%      
Mortgages $ 73,909,000   $ 73,909,000   73,480,000  
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%   10.00%      
Mortgages $ 1,604,000   $ 1,604,000   $ 1,604,000