Other Assets - Notes Receivable (Details) - USD ($) $ in Thousands	1 Months Ended				12 Months Ended
	Mar. 31, 2019	Nov. 30, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables
Notes receivable					$ 2,265	$ 9,522
Proceeds from collection of principal					3,004	68	$ 328
Allowance for notes receivable					0	0
PCR Note
Receivables
Notes receivable						$ 5,000
Interest rate on note receivable (as a percent)						10.00%
Pier Park Community Development District notes, non-interest bearing, due September 2022
Receivables
Notes receivable					803	$ 1,527
Interest bearing homebuilder note - 5.5% interest rate, due September 2019
Receivables
Notes receivable					$ 749	$ 904
Interest rate (as a percent)					5.50%	5.50%
Proceeds of principal payment			$ 100
Interest bearing homebuilder note - 5.5% interest rate, due June 2019
Receivables
Notes receivable					$ 422	$ 857
Interest rate (as a percent)					5.50%	5.50%
Proceeds of principal payment				$ 100
Interest bearing homebuilder note - 5.5% interest rate, due November 2019
Receivables
Notes receivable						$ 1,060
Interest rate (as a percent)						5.50%
Proceeds of principal payment		$ 100
Interest bearing homebuilder note - 6.3% interest rate, due March 2020
Receivables
Notes receivable					$ 150
Interest rate (as a percent)					6.30%
Interest bearing homebuilder note - 6.3% interest rate, due March 2020 | Maximum | Forecast
Receivables
Proceeds of principal payment	$ 100
Various other seller financing maturing December 2022 through November 2023
Receivables
Notes receivable					$ 141	$ 174