Notes Receivable (Information Relating To Bluegreen's Notes Receivable) (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017		Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross notes receivable		$ 567,783	$ 550,649
Allowance for loan losses		(128,299)	(123,791)
Notes receivable, net		$ 439,484	$ 426,858	[1]	$ 425,800
Allowance as a % of gross notes receivable		23.00%	22.00%
Notes Receivable Secured By VOIs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross notes receivable		$ 566,797	$ 549,320
Notes receivable, net		$ 438,597	$ 425,662
Allowance as a % of gross notes receivable		23.00%	23.00%
Notes Receivable Secured By Homesites [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross notes receivable	[2]	$ 986	$ 1,329
Allowance for loan losses	[2]	(99)	(133)
Notes receivable, net	[2]	$ 887	$ 1,196
Allowance as a % of gross notes receivable	[2]	10.00%	10.00%
VOI Notes Receivable - Non-Securitized [Member] | Notes Receivable Secured By VOIs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross notes receivable		$ 167,717	$ 184,971
Allowance for loan losses		(37,341)	(38,497)
VOI Notes Receivable - Securitized [Member] | Notes Receivable Secured By VOIs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross notes receivable		399,080	364,349
Allowance for loan losses		$ (90,859)	$ (85,161)

[1] * See Note 2 for summary of adjustments.

[2] Notes receivable secured by homesites were originated through a business, substantially all the assets of which were sold by us in 2012.