Annual report pursuant to Section 13 and 15(d)

Notes Receivable (Activity In The Allowance For Loan Losses) (Details)

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Notes Receivable (Activity In The Allowance For Loan Losses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Notes Receivable [Abstract]    
Balance, beginning of year $ 115,590 $ 110,714
Provision for credit losses 46,149 44,337
Less: Write-offs of uncollectible receivables (42,891) (39,461)
Balance, end of year $ 118,848 $ 115,590