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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2011 property segment Y count state | Sep. 30, 2010 | Sep. 30, 2011 property segment Y count state | Sep. 30, 2010 | Dec. 31, 2010
Segment Reporting |  |  |  |  |
Number of reportable segments | 2 |  | 2 |  |
Revenues: |  |  |  |  |
Rental income | $ 102,546 | $ 80,961 | $ 300,527 | $ 242,173 |
Residents fees and services | 10,731 |  | 11,575 |  |
Total revenues | 113,277 | 80,961 | 312,102 | 242,173 |
Expenses: |  |  |  |  |
Depreciation expense | 28,824 | 22,505 | 82,120 | 67,139 |
Property operating expenses | 19,754 | 4,599 | 40,572 | 13,138 |
General and administrative | 6,608 | 5,545 | 19,618 | 16,439 |
Acquisition related costs | 2,620 | 286 | 6,547 | 725 |
Impairment of assets | 1,028 |  | 1,194 | 1,095 | 5,965
Total expenses | 58,834 | 32,935 | 150,051 | 98,536 |
Operating income (loss) | 54,443 | 48,026 | 162,051 | 143,637 |
Interest and other income | 462 | 203 | 971 | 703 |
Interest expense | (24,730) | (20,226) | (70,837) | (59,155) |
Loss on early extinguishment of debt |  |  | (427) | (2,433) |
Gain on sale of properties |  | 109 | 21,315 | 109 |
Equity in earnings of an investee | 28 | 35 | 111 | (17) |
Income before income tax expense | 30,203 | 28,147 | 113,184 | 82,844 |
Income tax expense | (207) | (69) | (365) | (223) |
Net income | 29,996 | 28,078 | 112,819 | 82,621 |
Total assets | 4,003,313 | 2,999,712 | 4,003,313 | 2,999,712 | 3,392,656
Short and Long Term Residential Care Communities |  |  |  |  |
Revenues: |  |  |  |  |
Rental income | 58,391 | 56,895 | 172,686 | 170,219 |
Residents fees and services | 10,731 |  | 11,575 |  |
Total revenues | 69,122 |  | 184,261 |  |
Expenses: |  |  |  |  |
Depreciation expense | 18,369 | 16,571 | 52,112 | 49,533 |
Property operating expenses | 8,603 |  | 9,212 |  |
Impairment of assets | 1,028 |  | 1,028 | 1,095 |
Total expenses | 28,000 | 16,571 | 62,352 | 50,628 |
Operating income (loss) | 41,122 | 40,324 | 121,909 | 119,591 |
Interest expense | (11,152) | (10,574) | (31,751) | (31,304) |
Gain on sale of properties |  | 109 | 21,236 | 109 |
Income before income tax expense | 29,970 | 29,859 | 111,394 | 88,396 |
Net income | 29,970 | 29,859 | 111,394 | 88,396 |
Total assets | 2,079,432 | 1,933,822 | 2,079,432 | 1,933,822 |
MOBs |  |  |  |  |
Revenues: |  |  |  |  |
Rental income | 39,716 | 19,743 | 114,575 | 58,986 |
Total revenues | 39,716 |  | 114,575 |  |
Expenses: |  |  |  |  |
Depreciation expense | 9,507 | 4,986 | 27,164 | 14,762 |
Property operating expenses | 11,151 | 4,599 | 31,360 | 13,138 |
Impairment of assets |  |  | 166 |  |
Total expenses | 20,658 | 9,585 | 58,690 | 27,900 |
Operating income (loss) | 19,058 | 10,158 | 55,885 | 31,086 |
Interest expense | (254) | (234) | (686) | (636) |
Gain on sale of properties |  |  | 79 |  |
Income before income tax expense | 18,804 | 9,924 | 55,278 | 30,450 |
Net income | 18,804 | 9,924 | 55,278 | 30,450 |
Total assets | 1,465,833 | 776,126 | 1,465,833 | 776,126 |
All Other Operations |  |  |  |  |
Revenues: |  |  |  |  |
Rental income | 4,439 | 4,323 | 13,266 | 12,968 |
Total revenues | 4,439 |  | 13,266 |  |
Expenses: |  |  |  |  |
Depreciation expense | 948 | 948 | 2,844 | 2,844 |
General and administrative | 6,608 | 5,545 | 19,618 | 16,439 |
Acquisition related costs | 2,620 | 286 | 6,547 | 725 |
Total expenses | 10,176 | 6,779 | 29,009 | 20,008 |
Operating income (loss) | (5,737) | (2,456) | (15,743) | (7,040) |
Interest and other income | 462 | 203 | 971 | 703 |
Interest expense | (13,324) | (9,418) | (38,400) | (27,215) |
Loss on early extinguishment of debt |  |  | (427) | (2,433) |
Equity in earnings of an investee | 28 | 35 | 111 | (17) |
Income before income tax expense | (18,571) | (11,636) | (53,488) | (36,002) |
Income tax expense | (207) | (69) | (365) | (223) |
Net income | (18,778) | (11,705) | (53,853) | (36,225) |
Total assets | $ 458,048 | $ 289,764 | $ 458,048 | $ 289,764 |

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