Notes Receivable (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Notes Receivable [Abstract]
Balance, beginning of period	$ 140,630	$ 134,133
Provision for loan losses	44,083	39,483
Less: Write-offs of uncollectible receivables	(34,908)	(38,340)
Balance, end of period	$ 149,805	$ 135,276

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant