Notes Receivable and Allowance for Losses Schedule Of Notes Receivable (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Notes Receivable, Related Parties	$ 61,634	$ 60,068
Allowance for losses on non-impaired loans	2,998	2,261
Allowance for losses on receivables specifically evaluated for impairment	8,288	8,289
Total loan reserves	11,286	10,550
Net carrying value	50,348	49,518
Current portion, net	14,923	14,415
Long-term portion, net	35,425	35,103
Forgivable Notes Receivable [Member]
Notes Receivable, Related Parties	16,950	16,235
Allowance for losses on non-impaired loans	1,695	1,623
Allowance for losses on receivables specifically evaluated for impairment	0	0
Total loan reserves	1,695	1,623
Net carrying value	15,255	14,612
Current portion, net	561	420
Long-term portion, net	14,694	14,192
Mezzanine & Other Notes Receivable [Member]
Notes Receivable, Related Parties	44,684	43,833
Allowance for losses on non-impaired loans	1,303	638
Allowance for losses on receivables specifically evaluated for impairment	8,288	8,289
Total loan reserves	9,591	8,927
Net carrying value	35,093	34,906
Current portion, net	14,362	13,995
Long-term portion, net	20,731	20,911
Senior Notes [Member]
Notes Receivable, Related Parties	27,842	27,549
Senior Notes [Member] | Forgivable Notes Receivable [Member]
Notes Receivable, Related Parties	0	0
Senior Notes [Member] | Mezzanine & Other Notes Receivable [Member]
Notes Receivable, Related Parties	27,842	27,549
Senior Subordinated Notes [Member]
Notes Receivable, Related Parties	15,020	15,019
Senior Subordinated Notes [Member] | Forgivable Notes Receivable [Member]
Notes Receivable, Related Parties	0	0
Senior Subordinated Notes [Member] | Mezzanine & Other Notes Receivable [Member]
Notes Receivable, Related Parties	15,020	15,019
Unsecured Notes [Member]
Notes Receivable, Related Parties	18,772	17,500
Unsecured Notes [Member] | Forgivable Notes Receivable [Member]
Notes Receivable, Related Parties	16,950	16,235
Unsecured Notes [Member] | Mezzanine & Other Notes Receivable [Member]
Notes Receivable, Related Parties	$ 1,822	$ 1,265