Commitments And Contingencies (Narrative) (Details)				9 Months Ended		12 Months Ended
	Jun. 13, 2019 USD ($)	Jan. 07, 2019 USD ($)	Feb. 28, 2018 item	Sep. 30, 2019 USD ($) store	Sep. 30, 2018 USD ($)	Dec. 31, 2015	Dec. 31, 2018 USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Payments to subsidies				$ 10,500,000	$ 2,200,000
Accrued liabilities and other				112,982,000			$ 80,364,000
Inventory purchased				$ 12,672,000	$ 23,405,000
Average annual default rates				8.60%		6.90%
Percent of total delinquencies subject to letters				15.00%
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				$ 8,000,000			0
Executive [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Accrued liabilities and other				300,000
Amount of future payment				$ 1,100,000			$ 2,000,000
Minimum [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Damages sought from lawsuit		$ 500,000
Bass Pro [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Litigation settlement	$ 20,000,000
Settlement agreement, period of exectution	15 days
Settlement agreement, payment per year for next four years	$ 4,000,000
Settlement agreement, amount kept as prepaid	1,500,000
Annual fee for each store assessed	70,000
Payment per vacation package sold	$ 32
Cancellation and refund period for vacation packages sold				45 days
Settlement agreement, reduction of traffic in excess of percentage	25.00%
Payments for legal settlements				$ 39,100,000
Accrued claims				$ 17,600,000
Number of stores vacation packages are sold | store				68
Percent of volume sales from agreement				13.00%	14.00%
Wonders Of Wildlife Foundation [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Annual fee for each store assessed	$ 700,000
Payment per vacation package sold	$ 5.00
Cancellation and refund period for vacation packages sold				45 days