Notes Receivable and Allowance or Losses Loans Acquired (Details) (USD $)	1 Months Ended				9 Months Ended
	Dec. 31, 2011	Dec. 02, 2011	Sep. 30, 2012 Notes Receivable [Member]	Dec. 31, 2011 Notes Receivable [Member]	Sep. 30, 2012 Mezzanine & Other Notes Receivable [Member]	Sep. 30, 2012 Senior Notes [Member] Notes Receivable [Member]	Dec. 31, 2011 Senior Notes [Member] Notes Receivable [Member]	Sep. 30, 2012 Mezzanine & Other Notes Receivable [Member] Senior Notes [Member] Notes Receivable [Member]	Dec. 31, 2011 Mezzanine & Other Notes Receivable [Member] Senior Notes [Member] Notes Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage Loans Acquired		$ 11,500,000
Payments to Acquire Mortgage Notes Receivable	7,900,000
Financing Receivable, Current			17,130,000	12,119,000		11,191,000	7,900,000	7,900,000	7,900,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield		1,800,000
Certain Loans Acquired Accretable Yield		7.36%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance, December 31, 2011					1,793,000
Additions					0
Accretion					(388,000)
Disposals					0
Reclassifications from nonaccretable yield					0
Balance, September 30, 2012					$ 1,405,000