Notes and Other Receivables (Details) (USD $)	3 Months Ended	6 Months Ended
	Mar. 31, 2012	Jun. 30, 2012		Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		$ 50,895,000		$ 66,369,000
Note receivable contributed to Elkhorn co-investment	12,400,000	900,000
Secured Due January 2012 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		0		7,331,000
Stated interest rate (in hundredths)		9.80%
Secured Due November 2012 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		875,000	[1]	12,428,000	[1]
Stated interest rate (in hundredths)		5.00%
Secured 1 Due December 2012 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		10,924,000		10,928,000
Stated interest rate (in hundredths)		8.80%
Secured 2 Due December 2012 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		6,372,000		6,422,000
Stated interest rate (in hundredths)		8.00%
Secured Due November 2013 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		971,000		971,000
Stated interest rate (in hundredths)		8.00%
Secured Due December 2014 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		3,212,000	[1]	3,221,000	[1]
Stated interest rate (in hundredths)		4.00%
Secured Due February 2014 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		18,075,000		17,646,000
Stated interest rate (in hundredths)		9.60%
Notes Receivable From Affiliates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		4,683,000		2,734,000
Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		$ 5,783,000		$ 4,688,000

[1] $12.4 million note receivable was contributed to the Elkhorn co-investment during the first quarter of 2012. An additional $0.9 million note was funded in the second quarter of 2012 which was contributed to the co-investment in the third quarter.