Notes and Other Receivables (Details) (USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Secured Due January 2012 [Member]	Dec. 31, 2012 Secured Due November 2012 [Member]	Dec. 31, 2012 Secured 1 Due December 2012 [Member]	Dec. 31, 2012 Secured 2 Due December 2012 [Member]	Dec. 31, 2012 Secured Due November 2013 [Member]	Dec. 31, 2012 Secured Due February 2014 [Member]	Dec. 31, 2012 Secured 2 Due February 2014 [Member]	Dec. 31, 2012 Secured Due December 2014 [Member]	Dec. 31, 2012 Wesco III [Member]	Dec. 31, 2012 Note and Other Receivables From Affiliates [Member]		Dec. 31, 2011 Note and Other Receivables From Affiliates [Member]		Dec. 31, 2012 Note and Other Receivables From Affiliates [Member] Secured Due January 2012 [Member]	Dec. 31, 2011 Note and Other Receivables From Affiliates [Member] Secured Due January 2012 [Member]	Dec. 31, 2012 Note and Other Receivables From Affiliates [Member] Secured Due November 2012 [Member]		Dec. 31, 2011 Note and Other Receivables From Affiliates [Member] Secured Due November 2012 [Member]		Dec. 31, 2012 Note and Other Receivables From Affiliates [Member] Secured 1 Due December 2012 [Member]	Dec. 31, 2011 Note and Other Receivables From Affiliates [Member] Secured 1 Due December 2012 [Member]	Dec. 31, 2012 Note and Other Receivables From Affiliates [Member] Secured Due November 2013 [Member]	Dec. 31, 2011 Note and Other Receivables From Affiliates [Member] Secured Due November 2013 [Member]	Dec. 31, 2012 Note and Other Receivables From Affiliates [Member] Secured Due February 2014 [Member]		Dec. 31, 2011 Note and Other Receivables From Affiliates [Member] Secured Due February 2014 [Member]		Dec. 31, 2012 Note and Other Receivables From Affiliates [Member] Secured 2 Due February 2014 [Member]	Dec. 31, 2011 Note and Other Receivables From Affiliates [Member] Secured 2 Due February 2014 [Member]	Dec. 31, 2012 Note and Other Receivables From Affiliates [Member] Secured Due December 2014 [Member]		Dec. 31, 2011 Note and Other Receivables From Affiliates [Member] Secured Due December 2014 [Member]		Dec. 31, 2012 Other Receivables [Member]	Dec. 31, 2011 Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		$ 66,163,000	$ 66,369,000										$ 28,896,000	[1]	$ 2,734,000	[1]	$ 0	$ 7,331,000	$ 0	[2]	$ 12,428,000	[2]	$ 0	$ 6,422,000	$ 971,000	$ 971,000	$ 10,800,000	[3]	$ 10,928,000	[3]	$ 18,499,000	$ 17,646,000	$ 3,212,000	[4]	$ 3,221,000	[4]	$ 3,785,000	$ 4,688,000
Stated interest rate (in hundredths)				9.80%	5.00%	8.00%		8.00%	8.80%	9.60%	4.00%
Variable rate basis							LIBOR					LIBOR
Basis spread on rate (in hundredths)		2.50%					8.00%					2.50%
Note receivable contributed to Elkhorn co-investment	12,400,000
Short term Bridge Loan												$ 26,000,000

[1] The Company provided a $26.0 million short-term bridge loan to Wesco III at a rate of LIBOR + 2.5%, permanent secured financing is expected to be placed on the property by the end of the first quarter 2013.

[2] $12.4 million note receivable was contributed to the Elkhorn co-investment during the first quarter of 2012.

[3] During the fourth quarter of 2012, the Company amended the loan to extend the maturity date to February 2014.

[4] During the first quarter 2012, the Company amended the loan secured by Vacationer RV Park to extend the maturity date to December 2014. Beginning January 1, 2012 the note which has a carrying value of $3.2 million, bears interest at a rate of 4%, and the borrower funds an impound account for capital replacement.