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Other Assets - Notes Receivable, Net (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 14, 2018
Mar. 31, 2018
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]      
Notes receivable   $ 5,465,000 $ 9,522,000
Notes receivable, allowance   0 0
PCR Note, secured by certain assets, 10% interest rate, principal payments due beginning September 2018 per agreed upon schedule, and any remaining amount outstanding is due by December 2020, paid in full February 2018      
Loans and Leases Receivable Disclosure [Line Items]      
Notes receivable   0 $ 5,000,000
Interest rate on loans receivable     10.00%
Mortgage loans on real estate, collections of principal $ 5,000,000    
Pier Park Community Development District notes, non-interest bearing, due September 2022      
Loans and Leases Receivable Disclosure [Line Items]      
Notes receivable   1,527,000 $ 1,527,000
Interest bearing homebuilder note, secured by the real estate sold — 5.5% interest rate, principal payment of $0.1 million due February 2019 and any remaining amount outstanding is due by February 2020      
Loans and Leases Receivable Disclosure [Line Items]      
Notes receivable   $ 1,204,000 0
Mortgage loans on real estate, interest rate   5.50%  
Mortgage loans on real estate, principal receivable   $ 100,000  
Interest bearing homebuilder note, secured by the real estate sold — 5.5% interest rate, principal payment of $0.1 million due September 2018 and any remaining amount outstanding is due by September 2019      
Loans and Leases Receivable Disclosure [Line Items]      
Notes receivable   $ 904,000 904,000
Mortgage loans on real estate, interest rate   5.50%  
Mortgage loans on real estate, principal receivable   $ 100,000  
Interest bearing homebuilder note, secured by the real estate sold — 5.5% interest rate, principal payment of $0.1 million due November 2018 and any remaining amount outstanding is due by November 2019      
Loans and Leases Receivable Disclosure [Line Items]      
Notes receivable   $ 804,000 1,060,000
Mortgage loans on real estate, interest rate   5.50%  
Mortgage loans on real estate, principal receivable   $ 100,000  
Interest bearing homebuilder note, secured by the real estate sold — 5.5% interest rate, principal payment of $0.1 million due June 2018 and any remaining amount outstanding is due by June 2019      
Loans and Leases Receivable Disclosure [Line Items]      
Notes receivable   $ 666,000 857,000
Mortgage loans on real estate, interest rate   5.50%  
Mortgage loans on real estate, principal receivable   $ 100,000  
Interest bearing homebuilder note, secured by the real estate sold — 6.3% interest rate, principal payment of less than $0.1 million due March 2019 and any remaining amount outstanding is due by March 2020      
Loans and Leases Receivable Disclosure [Line Items]      
Notes receivable   $ 200,000 0
Mortgage loans on real estate, interest rate   6.30%  
Mortgage loans on real estate, principal receivable   $ 100,000.0  
Various mortgage notes, secured by certain real estate, bearing interest at various rates      
Loans and Leases Receivable Disclosure [Line Items]      
Notes receivable   $ 160,000 $ 174,000