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Real Estate Properties (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2012
item
Jun. 30, 2011
item
Dec. 31, 2011
Jun. 30, 2012
Five Star
item
Jun. 30, 2012
Sunrise Senior Living, Inc.
item
Jun. 30, 2012
Acquisition
Five Star
Jun. 30, 2012
Acquisition
Five Star
Jul. 31, 2012
Acquisition
Stellar Senior Living, LLC
Jun. 30, 2012
Operations Transfer Agreement
TRS
item
May 31, 2012
Operations Transfer Agreement
Five Star
TRS
item
Jun. 30, 2012
Operations Transfer Agreement
Five Star
TRS
item
Jun. 30, 2012
Operations Transfer Agreement
Sunrise Senior Living, Inc.
item
May 31, 2012
Operations Transfer Agreement
Senior living communities
Sunrise Senior Living, Inc.
item
Feb. 29, 2012
Priceville, Alabama
Acquisition
Living units
item
Feb. 29, 2012
Priceville, Alabama
Acquisition
Senior living communities
May 31, 2012
Charleston, South Carolina
Acquisition
Living units
item
May 31, 2012
Charleston, South Carolina
Acquisition
Senior living communities
May 31, 2012
Charleston, South Carolina
Acquisition
Senior living communities
Five Star
May 31, 2012
Georgia
Acquisition
MOB
sqft
May 31, 2012
Georgia
Additional acquisition
MOB
sqft
Jun. 30, 2012
Hawaii
Acquisition
MOB
sqft
Jun. 30, 2012
Maryland
Acquisition
MOB
sqft
Jul. 31, 2012
Mount Pleasant, South Carolina
Acquisition
Living units
item
Jul. 31, 2012
Mount Pleasant, South Carolina
Acquisition
Senior living communities
Jul. 31, 2012
Houston, Texas
Acquisition
MOB
item
sqft
Jun. 30, 2012
Six states
Acquisition
item
Jun. 30, 2012
Six states
Acquisition
Senior living communities
item
Jun. 30, 2012
Six states
Acquisition
MOB
item
Jun. 30, 2012
Massachusetts
Acquisition
MOB
sqft
Jul. 31, 2012
Massachusetts
Sale
MOB
item
Jul. 31, 2012
Florida and Minnesota
Acquisition
MOB
sqft
Jun. 30, 2012
Pennsylvania
Sale
Senior living communities
item
Jul. 31, 2012
Colorado, Idaho and Washington
Acquisition
Living units
item
Jul. 31, 2012
Colorado, Idaho and Washington
Acquisition
Senior living communities
item
Jun. 30, 2012
Missouri and New York
Acquisition
Living units
item
Jul. 31, 2012
Minnesota
Acquisition
MOB
item
sqft
Real Estate Properties                                                                        
Number of properties owned 375                                                                      
Number of states in which properties are located 39                                                                      
Real Estate Properties                                                                        
Number of properties acquired or agreed to be acquired                                                 1 3 2 1           4    
Number of units                           92   59             232                   511   397  
Number of acquisition agreements                                                                       1
Aggregate purchase price of properties acquired, excluding closing costs                             $ 11,300   $ 8,059   $ 8,600 $ 23,100 $ 70,495 $ 18,250   $ 37,273 $ 16,850 $ 126,700         $ 7,750     $ 36,500   $ 15,275
Assumption of mortgage notes payable 56,789 48,062                               4,789     52,000         49,447               6,876   9,676
Intangible assets recorded related to acquisition                             583   362                                      
Intangible lease assets recorded                                     1,392 6,421 4,306                              
Intangible lease liabilities recorded                                     10   629                              
Number of properties acquired, referred as managed properties       24                                                                
Area of real estate properties acquired (in square feet)                                     28,440 111,538 204,429 92,180     63,082       35,000   52,858         76,637
Number of real estate properties leased         10       10       10                                              
Number of properties under accelerated lease termintion                       10 10                                              
Number of communities under accelerated lease termintion                   10   10                                                
Number of communities under management operations                   10 10                                                  
Payments to purchase the inventory and certain improvements owned by Sunrise 123,867 306,819                     1,000                                              
Number of properties classified as held for sale 2                                                         1   1        
Real estate properties, held for sale 1,715   1,715                                                     1,100            
Impairment of asset charges recorded 3,071 166                                                                    
Number of properties impaired 1 2                                                                    
Real estate improvements purchased       14,093   7,775 14,093                                                          
Increase or decrease in annual lease rent payable       1,137   625 1,137                                                          
Annual lease rent payable               $ 2,920