Dispositions of Real Estate and Discontinued Operations (Details) (USD $)	3 Months Ended
Mar. 31, 2013 item	Mar. 31, 2012 item
Dispositions of Real Estate and Land
Number of properties held for sale	0	3
Carrying value of properties classified as held for sale		$ 98,000,000
Operating income from discontinued operations
Rental and related revenues		3,430,000
Depreciation and amortization expenses		2,996,000
Operating expenses		18,000
Other expense, net		901,000
Net loss before gain on sales of real estate		(485,000)
Gain on sales of real estate, net of income taxes		2,856,000
Number of properties included in discontinued operations		4
Medical office
Dispositions of Real Estate and Land
Total consideration for disposition of real estate		$ 7,000,000

Number of properties included in discontinued operations during the period.

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- Definition

The number of properties held for sale at the reporting date.

+ References

No definition available.

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- Definition

Total consideration, cash and noncash, received by seller for the sale of real estate.

+ References

No definition available.

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- Definition

Amount of expense from discontinued operations, that reflects the allocation of the cost of tangible and intangible assets over the assets' useful lives.

+ References

No definition available.

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- Definition

Other income (loss) amounts, net of tax expense or benefit, relating to a disposal group that is classified as a component of the entity, exclusive of the following elsewhere enumerated categories: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

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- Definition

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 47

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After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Name Statement of Financial Accounting Standard (FAS)

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-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.

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- Definition

Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

+ References

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- Definition

Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SX 210.7-03.1(f))

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