Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	2 Months Ended			1 Months Ended
	Feb. 29, 2012 Dividend Declared - Common stockholders [Member]	Feb. 29, 2012 Dividend Declared - Class D preferred stockholders [Member]	Feb. 29, 2012 Dividend Declared - Class E preferred stockholders [Member]	Jan. 31, 2012 Friendly Ice Cream Corporation Bankruptcy of Tenant - Reorganization [Member]	Jan. 31, 2012 Buffet Holdings, Inc. Bankruptcy of Tenant - Reorganization [Member]	Feb. 29, 2012 Class F cumulative redeemable preferred stock [Member]	Feb. 15, 2017 Class F cumulative redeemable preferred stock [Member]	Mar. 15, 2012 Class F cumulative redeemable preferred stock [Member]
Subsequent Event [Line Items]
Dividend declared, date description	January 2012 and February 2012	January 2012 and February 2012	January 2012 and February 2012
Dividends payment date, description	February 2012 and March 2012	February 2012 and March 2012	February 2012 and March 2012
Common Stock, Dividends Per Share, Declared (in dollars per share)	$ 0.1455
Preferred Stock Class D, Dividends Per Share, Declared (in dollars per share)		$ 0.1536459
Preferred Stock Class E, Dividends Per Share, Declared (in dollars per share)			$ 0.140625
Total number of leases with the Company				121	86
Accepted leases with the Company				102
Rejected leases with the Company				19
Rental revenue from the tenant (in hundredths)					3.90%
Anticipated rejected leases with the Company					7
Issued preferred stock (in shares)						14.95
Stated rate (in hundredths)						6.625%
Underwriters overallotment option exercised (in shares)						1.95
Net proceeds from issuance						$ 361.7
Redeemable value (in dollars per share)							$ 25.00
Initial dividend to be paid (in dollars per share)								$ 0.1702257
Number of days covered (in days)								37D
Monthly stated dividends, recurring (in dollars per share)								$ 0.1380208