Notes Receivable and Allowance for Losses - Schedule Of Notes Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	$ 125,604	$ 124,884
Allowance for losses on receivables specifically evaluated for impairment	4,426	4,426
Allowance for losses on non-impaired loans	259	259
Total loan reserves	4,685	4,685
Net carrying value	120,919	120,199
Current portion, net	34,014	36,759
Long-term portion, net	86,905	83,440
Senior
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	93,617	94,349
Subordinated
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	29,458	28,100
Unsecured
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	$ 2,529	$ 2,435

Allowance for Losses on Receivables Specifically Evaluated for Impairment

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Allowance for Losses on Non-impaired Loans

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

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

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