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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 segment | Dec. 31, 2010 | Dec. 31, 2009
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of operating segments |  |  |  |  |  |  |  |  | 3 |  |
Number of reportable segments |  |  |  |  |  |  |  |  | 2 |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | $ 422,166 | $ 340,113 | $ 297,399
Residents fees and services |  |  |  |  |  |  |  |  | 27,851 |  |
Total revenues | 136,603 | 113,277 | 100,748 | 98,077 | 97,295 | 81,164 | 81,008 | 80,704 | 450,017 | 340,113 | 297,399
Expenses: |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 113,265 | 90,409 | 78,583
Property operating expenses |  |  |  |  |  |  |  |  | 68,967 | 20,169 | 14,901
General and administrative |  |  |  |  |  |  |  |  | 26,041 | 21,677 | 19,825
Acquisition related costs |  |  |  |  |  |  |  |  | 12,239 | 3,610 | 3,327
Impairment of assets |  |  |  |  |  |  |  |  | 1,990 | 5,965 | 15,530
Total expenses |  |  |  |  |  |  |  |  | 222,502 | 141,830 | 132,166
Operating income (loss) |  |  |  |  |  |  |  |  | 227,515 | 198,283 | 165,233
Interest and other income |  |  |  |  |  |  |  |  | 1,451 | 844 | 935
Interest expense |  |  |  |  |  |  |  |  | (98,262) | (80,017) | (56,404)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (427) | (2,433) |
Gain on sale of properties |  |  |  |  |  |  |  |  | 21,315 | 109 | 397
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 139 | (1) | (134)
Income before income tax expense |  |  |  |  |  |  |  |  | 151,731 | 116,785 | 110,027
Income tax expense |  |  |  |  |  |  |  |  | (312) | (300) | (312)
Net income | 38,599 | 29,996 | 51,048 | 31,776 | 33,864 | 28,078 | 24,559 | 29,984 | 151,419 | 116,485 | 109,715
Total assets | 4,383,048 |  |  |  | 3,392,656 |  |  |  | 4,383,048 | 3,392,656 | 2,987,926
Short and Long Term Residential Care Communities |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | 242,652 | 237,578 | 226,247
Residents fees and services |  |  |  |  |  |  |  |  | 27,851 |  |
Total revenues |  |  |  |  |  |  |  |  | 270,503 | 237,578 | 226,247
Expenses: |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 71,020 | 66,172 | 61,122
Property operating expenses |  |  |  |  |  |  |  |  | 21,639 |  |
Impairment of assets |  |  |  |  |  |  |  |  | 1,028 | 1,095 | 3,784
Total expenses |  |  |  |  |  |  |  |  | 93,687 | 67,267 | 64,906
Operating income (loss) |  |  |  |  |  |  |  |  | 176,816 | 170,311 | 161,341
Interest expense |  |  |  |  |  |  |  |  | (43,862) | (41,076) | (21,297)
Gain on sale of properties |  |  |  |  |  |  |  |  | 21,236 | 109 | 397
Income before income tax expense |  |  |  |  |  |  |  |  | 154,190 | 129,344 | 140,441
Net income |  |  |  |  |  |  |  |  | 154,190 | 129,344 | 140,441
Total assets | 2,461,532 |  |  |  | 1,905,938 |  |  |  | 2,461,532 | 1,905,938 | 1,972,435
MOB |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | 161,809 | 85,152 | 53,862
Total revenues |  |  |  |  |  |  |  |  | 161,809 | 85,152 | 53,862
Expenses: |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 38,453 | 20,445 | 13,669
Property operating expenses |  |  |  |  |  |  |  |  | 47,328 | 20,169 | 14,901
Impairment of assets |  |  |  |  |  |  |  |  | 962 | 4,870 | 11,746
Total expenses |  |  |  |  |  |  |  |  | 86,743 | 45,484 | 40,316
Operating income (loss) |  |  |  |  |  |  |  |  | 75,066 | 39,668 | 13,546
Interest expense |  |  |  |  |  |  |  |  | (996) | (862) | (743)
Gain on sale of properties |  |  |  |  |  |  |  |  | 79 |  |
Income before income tax expense |  |  |  |  |  |  |  |  | 74,149 | 38,806 | 12,803
Net income |  |  |  |  |  |  |  |  | 74,149 | 38,806 | 12,803
Total assets | 1,487,364 |  |  |  | 1,167,994 |  |  |  | 1,487,364 | 1,167,994 | 738,093
All Other Operations |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | 17,705 | 17,383 | 17,290
Total revenues |  |  |  |  |  |  |  |  | 17,705 | 17,383 | 17,290
Expenses: |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 3,792 | 3,792 | 3,792
General and administrative |  |  |  |  |  |  |  |  | 26,041 | 21,677 | 19,825
Acquisition related costs |  |  |  |  |  |  |  |  | 12,239 | 3,610 | 3,327
Total expenses |  |  |  |  |  |  |  |  | 42,072 | 29,079 | 26,944
Operating income (loss) |  |  |  |  |  |  |  |  | (24,367) | (11,696) | (9,654)
Interest and other income |  |  |  |  |  |  |  |  | 1,451 | 844 | 935
Interest expense |  |  |  |  |  |  |  |  | (53,404) | (38,079) | (34,364)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (427) | (2,433) |
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 139 | (1) | (134)
Income before income tax expense |  |  |  |  |  |  |  |  | (76,608) | (51,365) | (43,217)
Income tax expense |  |  |  |  |  |  |  |  | (312) | (300) | (312)
Net income |  |  |  |  |  |  |  |  | (76,920) | (51,665) | (43,529)
Total assets | $ 434,152 |  |  |  | $ 318,724 |  |  |  | $ 434,152 | $ 318,724 | $ 277,398

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- Definition The aggregate revenue from real estate operations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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