Real Estate Leases and Mortgage Notes Receivable (Details Textual) (USD $)	12 Months Ended		36 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Customers	Dec. 31, 2009	Dec. 31, 2008
Real Estate Leases and Mortgage Notes Receivable (Textual) [Abstract]
Mortgage notes receivable	$ 97,381,000	$ 36,599,000	$ 36,599,000	$ 31,008,000	$ 59,001,000
Number of customer account for 10% or more of company's revenues including revenue from discontinued operations			0
Real Estate Leases and Mortgage Notes Receivable (Additional Textual) [Abstract]
Expiration date of fixed-term operating leases	Through 2029	Through 2020
Renewal term for lease and financial agreements	Five years or multiple thereof in addition to market rate renewal terms
Purchase price under purchase option provision	greater of fair market value or an amount equal to the Company’s gross investment
Approximate Investment in real estate properties subject to outstanding contractual option to purchase	108,900,000
Baylor Health System [Member]
Real Estate Leases and Mortgage Notes Receivable (Textual) [Abstract]
Number of customer account for 10% or more of company's revenues including revenue from discontinued operations	1
Ladco [Member]
Real Estate Leases and Mortgage Notes Receivable (Textual) [Abstract]
Mortgage notes receivable	41,500,000
Mortgage notes receivable percentage	42.50%
United Trust Fund [Member]
Real Estate Leases and Mortgage Notes Receivable (Textual) [Abstract]
Mortgage notes receivable	$ 40,500,000
Mortgage notes receivable percentage	41.50%