Notes Receivable (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Notes Receivable [Abstract]
Balance, beginning of period	$ 134,223	$ 123,791
Provision for loan losses	11,145	8,006
Less: Write-offs of uncollectible receivables	(8,462)	(9,100)
Balance, end of period	$ 136,906	$ 122,697