Acquisitions and Dispositions (Details 1) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 sqft
Asset Acquisitions
Cash Consideration	$ 35.1
Real Estate	33.1
Mortgage Note Financing	1.4
Other	0.6
Square Footage	158,081
Real Estate Acquisitions [Member]
Asset Acquisitions
Cash Consideration	23.8
Real Estate	33.1
Mortgage Note Financing	(9.9)
Other	0.6
Square Footage	158,081
Real Estate Acquisitions [Member] | South Dakota [Member]
Asset Acquisitions
Date Acquired	Jan. 20, 2012
Cash Consideration	15.0
Real Estate	14.9
Mortgage Note Financing	0
Other	0.1
Square Footage	58,285
Percentage of Medical Office Building Leased	100.00%
Lease Expiration Date	2022
Real Estate Acquisitions [Member] | North Carolina [Member]
Asset Acquisitions
Date Acquired	Feb. 10, 2012
Cash Consideration	6.4
Real Estate	6.4
Mortgage Note Financing	0
Other	0
Square Footage	23,312
Percentage of Medical Office Building Leased	100.00%
No of Buildings Occupied by Tenants	2
Percentage of Medical Office Building Occupied	93.00%
Number of Medical Office Buildings in Health System	6
Area Covered under Real Estate Owned in Measurement Unit	187,000
Real Estate Acquisitions [Member] | Pennsylvania [Member]
Asset Acquisitions
Date Acquired	Mar. 16, 2012
Cash Consideration	1.2
Real Estate	1.1
Mortgage Note Financing	0
Other	0.1
Square Footage	0
Acquired Land Related to Currently Owned Building Previous (in acres)	9.14
Real Estate Acquisitions [Member] | Texas [Member]
Asset Acquisitions
Date Acquired	May 23, 2012
Cash Consideration	1.2
Real Estate	10.7
Mortgage Note Financing	(9.9)
Other	0.4
Square Footage	76,484
Percentage of Medical Office Building Leased	100.00%
Mortgage Note Financing [Member]
Asset Acquisitions
Cash Consideration	11.3
Real Estate	0
Mortgage Note Financing	11.3
Other	0
Square Footage	0
Mortgage Note Financing [Member] | Texas [Member]
Asset Acquisitions
Other	0
Square Footage	0
Mortgage Note Financing [Member] | Texas [Member] | Mortgage Note Receivable Due January 2014 [Member]
Asset Acquisitions
Date Acquired	Jan. 10, 2012
Cash Consideration	3.0
Mortgage Note Financing	3.0
Number of Held for Sale Properties Sold	2
Stated interest rate	7.25%
Debt Instruments Maturity Date	January 2014
Mortgage Note Financing [Member] | Texas [Member] | Mortgage Note Receviable Due April 2012 [Member]
Asset Acquisitions
Date Acquired	Mar. 16, 2012
Cash Consideration	4.5
Mortgage Note Financing	4.5
Debt Instruments Maturity Date	April 2012
Mortgage Note Financing [Member] | Florida [Member]
Asset Acquisitions
Other	0
Square Footage	0
Mortgage Note Financing [Member] | Florida [Member] | Mortgage Loan Receviable Due April 2015 [Member]
Asset Acquisitions
Date Acquired	Apr. 18, 2012
Cash Consideration	3.8
Mortgage Note Financing	$ 3.8
Number of Held for Sale Properties Sold	2
Stated interest rate	7.50%
Debt Instruments Maturity Date	April 2015