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Pro Forma Information (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 2 Months Ended | 12 Months Ended
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Nov. 30, 2009 Property | Jun. 30, 2011 Property | 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 Property | Dec. 31, 2010 Property | Dec. 31, 2009 Property | Jan. 31, 2011 Senior unsecured notes 4.30% | Dec. 31, 2011 Senior unsecured notes 4.30% | Dec. 31, 2011 Unsecured revolving credit facility | Jun. 30, 2011 Unsecured revolving credit facility | Jun. 30, 2011 Previous unsecured revolving credit facility | Dec. 31, 2010 Previous unsecured revolving credit facility | Dec. 31, 2011 Senior unsecured notes 6.75% | Apr. 30, 2010 Senior unsecured notes 6.75% | Dec. 31, 2011 Unsecured senior notes due 2021 | May 31, 2010 Senior unsecured notes 7.875% | Dec. 31, 2011 Senior unsecured notes 7.875% | Dec. 31, 2010 Senior unsecured notes 7.875% | Dec. 31, 2011 Five Star | Dec. 31, 2010 Five Star | Feb. 29, 2012 Senior living communities Five Star Property | Dec. 31, 2011 Senior living communities Five Star Property | Dec. 31, 2011 Acquisition | Dec. 31, 2011 Acquisition Senior living communities Property | Jun. 30, 2011 Acquisition MOB Property | Dec. 31, 2011 Acquisition MOB Property | Dec. 31, 2010 Acquisition MOB Property | Dec. 31, 2011 Sale | Dec. 31, 2011 Sale MOB Property | Dec. 31, 2011 Sale Skilled nursing facilities Property | Dec. 31, 2010 Sale Skilled nursing facilities Property | Dec. 31, 2011 Sale Assisted living community Property
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  | 28 | 4 | 28 | 26 |  |  |  |  |
Aggregate purchase price of properties acquired, excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,300 | $ 11,300 |  |  |  | $ 991,618 | $ 433,955 |  |  |  |  |
Number of properties sold | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 4 | 4 | 1
Aggregate sale price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,460 |  |  | 1,450 |
Gain on sale of properties |  |  |  |  |  |  |  |  |  |  | 21,315 | 109 | 397 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,315 |  |  |  |
Real estate improvements purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,269 | 31,894 |  |  |  |  |  |  |  |  |  |  |  |
Impairment of asset charges recorded |  |  |  |  |  |  |  |  |  |  | 1,990 | 5,965 | 15,530 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties impaired |  |  |  |  |  |  |  |  |  |  | 4 | 7 | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.30% | 4.30% |  |  |  |  | 6.75% | 6.75% | 6.75% |  |  | 7.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt sold |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  | 300,000 | 200,000 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing fees |  |  | 13,760 |  |  |  | 4,661 |  |  |  | 13,760 | 4,661 |  | 1,973 |  |  | 6,723 |  | 826 | 2,487 | 2,907 | 2,487 |  | 1,973 |  |  |  |  |  | 2,540 |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  |  | 1,500,000 |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  | 750,000 | 750,000 | 550,000 | 550,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 427 | 2,433 |  |  |  |  |  | 427 |  |  |  |  | 2,433 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 97,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  | 217,317 | 2,458 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on mortgage debt assumed (as a percent) |  |  | 5.94% |  |  |  |  |  |  |  | 5.94% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | 136,603 | 113,277 | 100,748 | 98,077 | 97,295 | 81,164 | 81,008 | 80,704 | 450,017 | 340,113 | 297,399 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,395 |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,604 |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 98,262 | 80,017 | 56,404 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,915 |  |  |  |  |  |  |  |  |
Pro forma results of operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  | 589,898 | 586,577 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | $ 150,575 | $ 137,198 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per common share data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.93 | $ 0.84 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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