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Real Estate Sales - RiverTown Sale (Details)
3 Months Ended 12 Months Ended
Apr. 02, 2014
USD ($)
a
Jun. 30, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mar. 31, 2014
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Impact fees received     $ 400,000 $ 100,000 $ 100,000  
Long term debt     55,040,000 54,474,000    
Total Community Development District debt     $ 22,600,000 $ 22,500,000    
RiverTown Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proposed land sale, area of land (in acres) | a 4,057          
Cash proceeds from sale of real estate $ 24,000,000.0          
Notes received in sale of real estate 19,600,000.0          
Proposed land sale, expected impact fee credit, period for recognition     3 years      
Net earnings before income taxes for real estate sale   $ 26,000,000        
Minimum | RiverTown Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proposed land sale, expected impact fee credit 20,000,000          
Maximum | RiverTown Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proposed land sale, expected impact fee credit 26,000,000          
Community Development District debt, secured by certain real estate and standby note purchase agreements, due May 2016 — May 2039, bearing interest at 2.8% to 7.0% | Rivers Edge CDD Assessments            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Long term debt $ 11,000,000          
Total Community Development District debt           $ 5,400,000