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Dispositions, Assets Held for Sale and Discontinued Operations (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Real property dispositions:          
Property dispositions     $ 184,382,000 $ 186,713,000 $ 185,501,000
Add: Gain on sales of real property 26,184,000 56,380,000 36,115,000 43,394,000 163,933,000
Land America settlement         2,500,000
Extinguishment of other assets (liabilities)         (116,000)
Seller financing on sales of real property     (1,470,000) (6,100,000) (64,771,000)
Proceeds from sales of real property     219,027,000 224,007,000 287,047,000
Revenues:          
Rental income     38,753,000 59,304,000 82,913,000
Other income       8,059,000  
Expenses:          
Interest expense     7,779,000 11,176,000 19,684,000
Property operating expenses     5,662,000 4,964,000 5,566,000
Provision for depreciation     13,288,000 21,628,000 31,711,000
Income (loss) from discontinued operations, net     12,024,000 29,595,000 25,952,000
Senior housing facilities [Member]
         
Real property dispositions:          
Property dispositions     3,438,000 55,320,000 163,622,000
Senior housing facilities [Member] | Senior Housing Triple Net [Member]
         
Real property dispositions:          
Property dispositions     3,438,000 55,320,000 163,622,000
Skilled nursing facilities [Member]
         
Real property dispositions:          
Property dispositions     166,852,000 45,835,000 6,290,000
Skilled nursing facilities [Member] | Senior Housing Triple Net [Member]
         
Real property dispositions:          
Property dispositions     166,852,000 45,835,000 6,290,000
Hospitals [Member]
         
Real property dispositions:          
Property dispositions       40,841,000 8,735,000
Hospitals [Member] | Medical Facilities [Member]
         
Real property dispositions:          
Property dispositions       40,841,000 8,735,000
Medical office buildings [Member]
         
Real property dispositions:          
Property dispositions     14,092,000 44,717,000 6,781,000
Medical office buildings [Member] | Medical Facilities [Member]
         
Real property dispositions:          
Property dispositions     14,092,000 44,717,000 6,781,000
Land parcels [Member]
         
Real property dispositions:          
Property dispositions         73,000
Senior Housing Triple Net [Member]
         
Real property dispositions:          
Property dispositions     170,290,000 101,155,000 169,985,000
Add: Gain on sales of real property     36,274,000 32,084,000 151,457,000
Land America settlement         2,500,000
Seller financing on sales of real property       (6,100,000) (59,649,000)
Proceeds from sales of real property     206,564,000 133,239,000 264,293,000
Medical Facilities [Member]
         
Real property dispositions:          
Property dispositions     14,092,000 85,558,000 15,516,000
Add: Gain on sales of real property     (159,000) 11,310,000 12,476,000
Extinguishment of other assets (liabilities)         (116,000)
Seller financing on sales of real property     (1,470,000)   (5,122,000)
Proceeds from sales of real property     $ 12,463,000 $ 90,768,000 $ 22,754,000