v2.4.0.6

Concentration of Credit Risk (Details) | 12 Months Ended
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Dec. 31, 2011 state province | Dec. 31, 2010 | Dec. 31, 2009
Concentration of credit risk |  |  |
Number of states | 46 |  |
Revenue concentration risk percentage | 10.00% | 10.00% | 10.00%
Number of Canadian provinces | 2 |  |
Seniors housing communities |  |  |
Concentration of credit risk |  |  |
Number of seniors housing communities under long-term management agreements | 197 |  |
Brookdale Senior Living |  |  |
Concentration of credit risk |  |  |
Percentage of total revenues derived by third party | 8.20% | 11.90% | 12.90%
Percentage of net operating income derived from lease agreements | 13.40% | 17.30% | 19.10%
Total gross book value of properties | Seniors housing communities |  |  |
Concentration of credit risk |  |  |
Percentage of real estate investments based on gross book value (as a percent) | 66.70% |  |
Total gross book value of properties | Skilled nursing facilities, hospitals, MOBs and other healthcare assets |  |  |
Concentration of credit risk |  |  |
Percentage of real estate investments based on gross book value (as a percent) | 33.30% |  |
Total gross book value of properties | ATRIA |  |  |
Concentration of credit risk |  |  |
Percentage of real estate investments based on gross book value (as a percent) | 19.00% |  |
Total gross book value of properties | Brookdale Senior Living |  |  |
Concentration of credit risk |  |  |
Percentage of real estate investments based on gross book value (as a percent) | 13.00% |  |
Total gross book value of properties | KINDRED |  |  |
Concentration of credit risk |  |  |
Percentage of real estate investments based on gross book value (as a percent) | 5.00% |  |
Total gross book value of properties | SUNRISE |  |  |
Concentration of credit risk |  |  |
Percentage of real estate investments based on gross book value (as a percent) | 14.40% |  |
Total revenues | KINDRED |  |  |
Concentration of credit risk |  |  |
Percentage of real estate investments based on gross book value (as a percent) | 14.30% | 24.20% | 26.20%
Total NOI | KINDRED |  |  |
Concentration of credit risk |  |  |
Percentage of real estate investments based on gross book value (as a percent) | 23.20% | 35.60% | 38.50%
Total revenues or NOI | Minimum | California |  |  |
Concentration of credit risk |  |  |
Number of states accounting for more than 10% of total revenues | 1 |  |
Total revenues or NOI | Minimum | Two states |  |  |
Concentration of credit risk |  |  |
Number of states accounting for more than 10% of total revenues |  | 2 | 2

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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