Other Assets - Notes Receivable (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Receivables
Notes receivable	$ 2,724	$ 2,265
Allowance for notes receivable	0	$ 0
Interest bearing homebuilder note - 5.5% interest rate, due June 2021
Receivables
Notes receivable	$ 1,514
Interest rate (as a percent)	5.50%	5.50%
Interest bearing note with a JV partner, secured by the partner's membership interest in the JV - 8.0% interest rate, due May 2039
Receivables
Notes receivable	$ 363
Interest rate, note (as a percent)	8.00%
Interest bearing note with a JV partner, secured by the partner's membership interest in the JV - 8.0% interest rate, due July 2039
Receivables
Notes receivable	$ 210
Interest rate, note (as a percent)	8.00%
Interest bearing homebuilder note - 5.5% interest rate, due June 2020
Receivables
Notes receivable	$ 253	$ 422
Interest rate (as a percent)	5.50%	5.50%
Interest bearing homebuilder note - 5.5% interest rate, due January 2020
Receivables
Notes receivable	$ 166	$ 749
Interest rate (as a percent)	5.50%	5.50%
Interest bearing homebuilder note - 6.3% interest rate, due March 2020
Receivables
Notes receivable	$ 128	$ 150
Interest rate (as a percent)	6.30%	6.30%
Various mortgage notes, secured by certain real estate, bearing interest at various rates
Receivables
Notes receivable	$ 90	$ 141
Pier Park Community Development District notes, non-interest bearing, paid in full August 2019
Receivables
Notes receivable		$ 803