Notes and Other Receivables (Details) (USD $)	9 Months Ended		9 Months Ended				9 Months Ended		9 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2013 Note	Dec. 31, 2012	Sep. 30, 2013 Secured Due December 2014 [Member]		Dec. 31, 2012 Secured Due December 2014 [Member]		Sep. 30, 2013 Secured Due May 2013 [Member]	Dec. 31, 2012 Secured Due May 2013 [Member]	Sep. 30, 2013 Secured Due March 2013 [Member]	Dec. 31, 2012 Secured Due March 2013 [Member]	Sep. 30, 2013 Secured Effective March 2013 [Member]	Dec. 31, 2012 Secured Effective March 2013 [Member]	Jun. 30, 2013 Fund II [Member]	Jun. 30, 2013 Wesco III [Member]	Mar. 31, 2013 Wesco III [Member]	Sep. 30, 2013 Note and Other Receivables From Affiliates [Member]		Dec. 31, 2012 Note and Other Receivables From Affiliates [Member]		Sep. 30, 2013 Other Receivables [Member]	Dec. 31, 2012 Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 67,628,000	$ 66,163,000	$ 3,212,000	[1]	$ 3,212,000	[1]	$ 0	$ 971,000	$ 0	$ 10,800,000	$ 0	$ 18,499,000				$ 60,820,000	[2]	$ 28,896,000	[2]	$ 3,596,000	$ 3,785,000
Income related acceleration	800,000
Stated interest rate (in hundredths)			4.00%				8.00%		8.80%		9.60%				3.10%
Variable rate basis													LIBOR + 1.75%	LIBOR + 2.50%
Basis spread on rate (in hundredths)													1.75%	2.50%
Number of notes for which payment was received	3
Proceeds from notes receivable	30,500,000														27,300,000
Short term Bridge Loan													$ 42,400,000	$ 56,800,000	$ 26,000,000
Term of loan															7 years

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

[2] During the second quarter of 2013, the Company provided short-term bridge loans to Fund II and Wesco III of $42.4 million and $56.8 million, respectively, at rates of LIBOR + 1.75% and LIBOR + 2.50%, respectively. In July 2013, Fund II repaid the Company for $42.4 million in short-term loans.