Notes Receivable and Allowance or Losses Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Dec. 02, 2011
Notes Receivable, Related Parties	$ 35,367,000		$ 35,367,000		$ 29,840,000
Allowance for losses on non-impaired loans	9,454,000		9,454,000		9,228,000
Amortization expense	1,995,000	2,073,000	5,989,000	5,976,000
Receivables, allowance for doubtful accounts	10,885,000		10,885,000		9,979,000
Mortgage Loans Acquired						11,500,000
Certain Loans Acquired Accretable Yield						7.36%
Forgivable Notes Receivable [Member]
Notes Receivable, Related Parties	8,561,000		8,561,000		7,948,000
Allowance for losses on non-impaired loans	856,000		856,000		795,000
Amortization expense	700,000	600,000	2,000,000	1,700,000
Financing Receivable, Recorded Investment, Past Due	0		0		0
Mezzanine & Other Notes Receivable [Member]
Notes Receivable, Related Parties	26,806,000		26,806,000		21,892,000
Allowance for losses on non-impaired loans	8,598,000		8,598,000		8,433,000
Face value of notes value deemed impaired	12,700,000		12,700,000		11,200,000
Loan reserves	8,300,000		8,300,000		8,200,000
Impaired loans, carrying value	4,400,000		4,400,000		3,000,000
Interest income on impaired loans, cash basis method	38,000	0	100,000	0
Receivables, allowance for doubtful accounts	0		0		0
Impaired Financing Receivable, Interest Income, Accrual Method		0		0
Non-impaired Loans [Member] | Mezzanine & Other Notes Receivable [Member]
Allowance for losses on non-impaired loans	300,000		300,000		200,000
Notes Receivable [Member]
Financing Receivable, Recorded Investment, Current	17,130,000		17,130,000		12,119,000
Financing Receivable, Recorded Investment, Past Due	9,676,000		9,676,000		9,773,000
Senior Notes [Member]
Notes Receivable, Related Parties	11,191,000		11,191,000		7,900,000
Senior Notes [Member] | Forgivable Notes Receivable [Member]
Notes Receivable, Related Parties	0		0		0
Senior Notes [Member] | Mezzanine & Other Notes Receivable [Member]
Notes Receivable, Related Parties	11,191,000		11,191,000		7,900,000
Senior Notes [Member] | Notes Receivable [Member]
Financing Receivable, Recorded Investment, Current	11,191,000		11,191,000		7,900,000
Financing Receivable, Recorded Investment, Past Due	0		0		0
Senior Notes [Member] | Notes Receivable [Member] | Mezzanine & Other Notes Receivable [Member]
Financing Receivable, Recorded Investment, Current	$ 7,900,000		$ 7,900,000		$ 7,900,000