Significant Tenant (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operations
Total revenues	$ 189,429	$ 145,073
Operating income	64,690	60,918
Net income	35,235	32,352
Cash Flows
Cash provided by operating activities	73,696	72,374
Change in cash and cash equivalents	(3,393)	1,742
Cash and cash equivalents at beginning of period	42,382	23,560
Cash and cash equivalents at end of period	38,989	25,302
Investment | Rents from significant lessee | Five Star
Operations
Total revenues	360,052	327,150
Operating income	2,405	3,001
Income from continuing operations	2,314	1,222
Net income	1,935	369
Cash Flows
Cash provided by operating activities	2,011	7,392
Net cash (used in) provided by discontinued operations	(2,161)	107
Cash provided by (used in) investing activities	(9,028)	(8,942)
Cash (used in) provided by financing activities	(304)	(286)
Change in cash and cash equivalents	(9,482)	(1,729)
Cash and cash equivalents at beginning of period	24,638	28,374
Cash and cash equivalents at end of period	15,156	26,645
Financial Position
Current assets	140,178	144,195
Non-current assets	428,475	434,042
Total indebtedness	62,209	62,493
Current liabilities	183,006	190,841
Non-current liabilities	76,696	80,591
Total shareholders' equity	$ 308,951	$ 306,805