Notes Receivable and Allowance for Losses Schedule Of Notes Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	$ 139,446	$ 125,911
Allowance for losses on non-impaired loans	6,271	5,783
Allowance for losses on receivables specifically evaluated for impairment	1,647	1,647
Total loan reserves	7,918	7,430
Net carrying value	131,528	118,481
Current portion, net	7,650	7,873
Long-term portion, net	123,878	110,608
Forgivable Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	55,898	51,475
Allowance for losses on non-impaired loans	5,501	5,013
Allowance for losses on receivables specifically evaluated for impairment	0	0
Total loan reserves	5,501	5,013
Net carrying value	50,397	46,462
Current portion, net	311	333
Long-term portion, net	50,086	46,129
Mezzanine & Other Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	83,548	74,436
Allowance for losses on non-impaired loans	770	770
Allowance for losses on receivables specifically evaluated for impairment	1,647	1,647
Total loan reserves	2,417	2,417
Net carrying value	81,131	72,019
Current portion, net	7,339	7,540
Long-term portion, net	73,792	64,479
Senior
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	70,575	61,482
Senior | Forgivable Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	0	0
Senior | Mezzanine & Other Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	70,575	61,482
Subordinated
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	9,411	9,336
Subordinated | Forgivable Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	0	0
Subordinated | Mezzanine & Other Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	9,411	9,336
Unsecured
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	59,460	55,093
Unsecured | Forgivable Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	55,898	51,475
Unsecured | Mezzanine & Other Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	$ 3,562	$ 3,618