Concentration (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended														12 Months Ended											0 Months Ended	12 Months Ended
	Dec. 31, 2012 property	Dec. 31, 2011	Dec. 31, 2012 Hotels property	Dec. 31, 2012 Hotels InterContinental	Dec. 31, 2012 Travel centers property	Dec. 31, 2012 Credit Concentration property	Dec. 31, 2012 Credit Concentration Hotels Marriott (No. 234) property	Dec. 31, 2012 Credit Concentration Hotels InterContinental property	Dec. 31, 2012 Credit Concentration Hotels Sonesta No.1 property	Dec. 31, 2012 Credit Concentration Hotels Sonesta No.2 property	Dec. 31, 2012 Credit Concentration Hotels Hyatt property	Dec. 31, 2012 Credit Concentration Hotels Wyndham property	Dec. 31, 2012 Credit Concentration Hotels Carlson property	Dec. 31, 2012 Credit Concentration Hotels Marriott (No. 1) property	Dec. 31, 2012 Credit Concentration Hotels Marriott (No. 5) property	Dec. 31, 2012 Credit Concentration Hotels Morgans property	Dec. 31, 2012 Credit Concentration Travel centers TA (No. 1) property	Dec. 31, 2012 Credit Concentration Travel centers TA (No. 2) property	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Hotels Marriott (No. 234)	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Hotels InterContinental	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Hotels Sonesta No.1	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Hotels Sonesta No.2	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Hotels Hyatt	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Hotels Wyndham	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Hotels Carlson	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Hotels Marriott (No. 1)	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Hotels Marriott (No. 5)	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Hotels Morgans	Jan. 10, 2013 Credit Concentration Minimum Return/ Minimum Rent Travel centers TA (No. 1)	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Travel centers TA (No. 1)	Dec. 31, 2012 Credit Concentration Minimum Return/ Minimum Rent Travel centers TA (No. 2)	Dec. 31, 2012 Credit Concentration Investment	Dec. 31, 2012 Credit Concentration Investment Hotels Marriott (No. 234)	Dec. 31, 2012 Credit Concentration Investment Hotels InterContinental	Dec. 31, 2012 Credit Concentration Investment Hotels Sonesta No.1	Dec. 31, 2012 Credit Concentration Investment Hotels Sonesta No.2	Dec. 31, 2012 Credit Concentration Investment Hotels Hyatt	Dec. 31, 2012 Credit Concentration Investment Hotels Wyndham	Dec. 31, 2012 Credit Concentration Investment Hotels Carlson	Dec. 31, 2012 Credit Concentration Investment Hotels Marriott (No. 1)	Dec. 31, 2012 Credit Concentration Investment Hotels Marriott (No. 5)	Dec. 31, 2012 Credit Concentration Investment Hotels Morgans	Dec. 31, 2012 Credit Concentration Investment Travel centers TA (No. 1)	Dec. 31, 2012 Credit Concentration Investment Travel centers TA (No. 2)
Concentration
Number of properties	474		289		185	474	68	91	20	1	22	21	11	53	1	1	145	40
Minimum Return/ Minimum Rent																			$ 623,512	$ 101,837	$ 135,159	$ 37,081	$ 2,564	$ 22,037	$ 16,728	$ 12,920	$ 67,656	$ 9,749	$ 5,956		$ 154,105	$ 57,720
Concentration risk, percentage																			100.00%	15.00%	22.00%	6.00%	0.00%	4.00%	3.00%	2.00%	11.00%	2.00%	1.00%		25.00%	9.00%	100.00%	13.00%	19.00%	7.00%	0.00%	4.00%	3.00%	3.00%	10.00%	1.00%	2.00%	27.00%	11.00%
Investment																																	7,171,371	951,489	1,362,904	491,638	31,424	301,942	235,442	209,895	677,948	90,078	120,000	1,951,806	746,805
Ground rent due			239		447																									5,126
Guarantee provided to the entity, maximum							40,000				50,000	29,000	40,000
Guarantee provided to the entity, remaining amount							25,977				17,143	21,550	22,544
Number of real estate properties for which unlimited guarantee is provided															1
Security deposits	26,577	106,422		26,466
Net operating results	76,978	60,265
Reduction to operating expenses	46,386	58,772
Shortfalls due to unguaranteed portions of minimum returns	$ 30,592	$ 1,493