Notes and Other Receivables (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 11,359,000		$ 66,163,000
Income related acceleration	800,000
Variable rate basis	LIBOR + 2.5%
Basis spread on rate (in hundredths)	2.50%
Proceeds from notes receivable	29,500,000
Note receivable contributed to Elkhorn co investment	27,300,000
Short term Bridge Loan	26,000,000
Secured Due March 2013 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	0		10,800,000
Stated interest rate (in hundredths)	8.80%
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]	3,212,000	[1]
Stated interest rate (in hundredths)	4.00%
Secured Effective March 2013 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	0		18,499,000
Stated interest rate (in hundredths)	9.60%
Note and Other Receivables From Affiliates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	4,085,000		28,896,000
Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 3,091,000		$ 3,785,000

[1] The borrower funds an impound account for capital replacement.