Notes Receivable (Activity In The Allowance For Loan Losses) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Notes Receivable [Abstract]
Balance, beginning of period	$ 123,791
Provision for loan losses	21,447
Less: Write-offs of uncollectible receivables	(21,633)
Balance, end of period	$ 123,605