Notes Receivable (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Notes Receivable [Abstract]
Balance, beginning of period	$ 123,791	$ 120,270
Provision for loan losses	35,866	32,066
Less: Write-offs of uncollectible receivables	(31,358)	(31,581)
Balance, end of period	$ 128,299	$ 120,755