Commitments And Contingencies (Narrative) (Details)			1 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) store	Feb. 28, 2018 item	Sep. 30, 2020 USD ($) store	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($) item	Sep. 30, 2020 USD ($) store	Sep. 30, 2019 USD ($)	Dec. 31, 2021 store	Dec. 31, 2015	Dec. 31, 2020 store	Oct. 31, 2020 store	Jul. 07, 2020 plaintiff	Jun. 30, 2020 USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Settlement agreement, fixed fee				$ 5,200,000
Settlement agreement, amount kept as prepaid				1,300,000
Payments to subsidies							$ 7,700,000	$ 10,500,000
Accrued liabilities and other	$ 92,934,000		$ 92,934,000		$ 103,948,000		92,934,000
Inventory purchased							$ 3,408,000	$ 12,672,000
Average annual default rates							9.70%			6.90%
Percent of total delinquencies subject to letters	13.70%		13.70%				13.70%
Number of non-exempt employees represented | item		660
Purchase period, from lawsuit							6 years
Subsidies To Certain HOAs [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Accrued liabilities and other	$ 10,100,000		$ 10,100,000		0		$ 10,100,000
President And CEO [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Severance expense					$ 3,500,000
Amount of future payment	$ 1,800,000		1,800,000				$ 1,800,000
Period of future payment					18 months
Other Executives [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Severance expense			$ 2,500,000
Minimum [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Reduction of traffic in stores percentage							25.00%
Bass Pro [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Litigation settlement						$ 20,000,000.0
Settlement agreement, number of annual payments | item						5
Settlement agreement, payment amount						$ 4,000,000.0
Number of stores requiring a fixed annual fee | store							59
Payments for legal settlements				$ 4,000,000.0
Accrued claims						$ 39,100,000								$ 14,500,000
Cabela [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of stores vacation packages are sold | store	26		26				26
Number of stores open | store	5
Cabela [Member] | Subsequent Event [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of stores vacation packages are sold | store												4
Cabela [Member] | Forecast [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of stores requiring a fixed annual fee | store									60
Number of stores vacation packages are sold | store											14
Bass Pro And Cabela [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of stores vacation packages are sold | store	87		87				87
Bass Pro And Cabela [Member] | Subsequent Event [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of stores vacation packages are sold | store												97
Robert Barban [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of plaintiffs | plaintiff													172
Notes Receivable Secured By VOIs [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
VOI sales volume, percentage							11.00%	13.00%