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Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |
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Dec. 31, 2012 sqft | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Above market lease | Dec. 31, 2011 Above market lease | Dec. 31, 2012 In-place lease intangibles | Dec. 31, 2011 In-place lease intangibles | Dec. 31, 2012 Below market lease | Dec. 31, 2011 Below market lease | May 31, 2011 Senior living communities Five Star Property | Dec. 31, 2012 Acquisition Senior living communities item | Dec. 31, 2011 Acquisition Senior living communities item | Dec. 31, 2012 Acquisition MOBs item | Dec. 31, 2011 Acquisition MOBs item | Jul. 31, 2012 Acquisition Florida MOBs item | Jul. 31, 2011 Acquisition Florida MOBs item | Jun. 30, 2011 Acquisition Florida MOBs item | Aug. 31, 2011 Acquisition Florida Land acre Property | Dec. 31, 2012 Acquisition Colorado MOBs item | Dec. 31, 2012 Acquisition Texas MOBs item | Jul. 31, 2012 Acquisition Texas MOBs item | May 31, 2012 Acquisition Georgia MOBs item | Dec. 31, 2012 Acquisition Minnesota MOBs item | May 31, 2011 Acquisition Minnesota MOBs item | Jan. 31, 2011 Acquisition Minnesota MOBs item | Nov. 30, 2011 Acquisition Virginia MOBs item | Dec. 31, 2011 Acquisition Indiana MOBs item | Jun. 30, 2012 Acquisition Hawaii MOBs item | Dec. 31, 2012 Sale | Dec. 31, 2011 Sale Property | Dec. 31, 2012 Sale MOBs Property | Dec. 31, 2011 Sale MOBs Property | Dec. 31, 2011 Sale Skilled nursing facilities Property | Dec. 31, 2011 Sale Assisted living community Property | Dec. 31, 2012 Properties acquired in 2012 | Dec. 31, 2011 Properties acquired in 2011
Real estate properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold or agreed to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | 1 | 2 | 4 | 1 |  |
Aggregate sale price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |  |  | $ 1,100 | $ 39,460 |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  |  | 6 | 11 | 28 | 13 | 28 | 1 | 1 | 3 | 4 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 1 |  |  |  |  |  |  |  |
(Loss) gain on sale of properties | (101) | 21,315 | 109 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (101) | 21,315 |  |  |  |  |  |
Area of land (in acres) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible lease assets recorded | 161,419 | 130,153 |  | 45,290 | 39,075 | 116,129 | 91,078 |  |  |  |  |  | 32,684 | 52,209 | 789 | 354 | 599 |  | 3,196 | 4,006 | 1,973 | 1,392 | 4,087 | 1,403 | 2,722 | 1,897 | 4,867 | 4,306 |  |  |  |  |  |  | 41,764 | 52,210
Intangible lease liabilities recorded | 21,978 | 25,487 |  |  |  |  |  |  |  |  |  |  | 971 | 3,770 |  |  | 200 |  | 10 | 11 |  | 10 | 183 | 51 |  |  |  | 629 |  |  |  |  |  |  | 971 | 3,770
Accumulated amortization on lease assets |  |  |  | 13,675 | 9,612 | 31,907 | 20,306 | 8,286 | 7,709 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  | 6 years 8 months 12 days |  | 6 years 3 months 18 days |  | 7 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditure committed relating to leases | 6,599 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties leased (in square feet) | 636,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed but unspent tenant related obligations | 6,033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future amortization of intangible lease assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 24,419 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 19,098 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 14,532 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 12,411 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 10,255 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | $ 21,430 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the area of the real estate property. + References No definition available. + Details
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- Details
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- Definition Amount of committed but unspent tenant related obligations based on executed lease. + References No definition available. + Details
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- Definition Represents the amount of expenditure committed by entity relating to leases. + References No definition available. + Details
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- Definition This element represents the number of properties acquired or agreed to be acquired by the entity during the period. + References No definition available. + Details
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- Definition This element represents the number of properties sold or agreed to be sold by the entity. + References No definition available. + Details
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- Definition This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity during the period. + References No definition available. + Details
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- Definition Represents the intangible lease assets recorded as part of the real estate acquisition. + References No definition available. + Details
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- Definition Represents the intangible lease liabilities recorded as part of the real estate acquisition. + References No definition available. + Details
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- Definition Represents the area of the real estate property subject to an operating lease. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -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. + Details
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- Definition Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: 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. + Details
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