Acquisitions, Dispositions and Mortgage Repayments - Dispositions (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 sqft		Dec. 31, 2012 sqft		Dec. 31, 2011
Real Estate Dispositions [Line Items]
Sales Price	$ 101,900,000		$ 91,500,000
Closing Adjustments	1,500,000		5,500,000
Mortgage Notes	3,700,000		(13,500,000)
Proceeds from sale of cost method investment in real estate	96,700,000		134,600,000
Net Real Estate Investment	76,700,000
Other (including receivables)	2,300,000		(600,000)
Gain/ (Impairment)	21,400,000
Square Footage	541,502
Total dispositions and repayments Net Real Estate Investment			121,600,000
Total dispositions and repayments Gain/Impairment			100,000
Total dispositions and repayments Square Footage			871,428
Mortgage Interest	12,701,000		9,186,000		6,973,000
General and administrative	23,729,000		20,905,000		20,988,000
Real estate dispositions [Member]
Real Estate Dispositions [Line Items]
Sales Price	101,900,000		91,500,000
Closing Adjustments	1,500,000		5,500,000
Mortgage Notes	4,300,000		11,200,000
Proceeds from sale of cost method investment in real estate	96,100,000		74,800,000
Net Real Estate Investment	76,700,000		83,400,000
Other (including receivables)	2,300,000		2,800,000
Gain/ (Impairment)	21,400,000		(200,000)
Square Footage	541,502		757,826
Real estate dispositions [Member] | Medical Office Buidlings Disposed January 2012 [Member]
Real Estate Dispositions [Line Items]
Number of properties sold			2
Mortgage note repayments [Member]
Real Estate Dispositions [Line Items]
Mortgage Notes	600,000		(24,700,000)
Proceeds from sale of cost method investment in real estate	600,000		24,700,000
Deconsolidation of Vie [Member]
Real Estate Dispositions [Line Items]
Proceeds from sale of cost method investment in real estate			35,100,000	[1]
Net Real Estate Investment			38,200,000	[1]
Other (including receivables)			(3,400,000)	[1]
Gain/ (Impairment)			300,000	[1]
Total dispositions and repayments Square Footage			113,602	[1]
Mortgage Interest			400,000
General and administrative			100,000
PENNSYLVANIA | Pennsylvania One [Member] | Real estate dispositions [Member] | Inpatient Facility Disposed September 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	Sep. 30, 2013
Sales Price	17,600,000
Closing Adjustments	300,000
Mortgage Notes	0
Proceeds from sale of cost method investment in real estate	17,300,000
Net Real Estate Investment	12,200,000
Other (including receivables)	0
Gain/ (Impairment)	5,100,000
Square Footage	76,324
PENNSYLVANIA | Pennsylvania Two [Member] | Real estate dispositions [Member] | Inpatient Facility Disposed September 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	Sep. 30, 2013
Sales Price	17,600,000
Closing Adjustments	400,000
Mortgage Notes	0
Proceeds from sale of cost method investment in real estate	17,200,000
Net Real Estate Investment	12,600,000
Other (including receivables)	0
Gain/ (Impairment)	4,600,000
Square Footage	79,560
North Carolina [Member] | Real estate dispositions [Member]
Real Estate Dispositions [Line Items]
Date Disposed	Dec. 05, 2013
Sales Price	17,600,000
Closing Adjustments	0
Mortgage Notes	0
Proceeds from sale of cost method investment in real estate	17,600,000
Net Real Estate Investment	13,400,000
Other (including receivables)	2,100,000
Gain/ (Impairment)	2,100,000
Square Footage	57,580
Alabama [Member] | Real estate dispositions [Member]
Real Estate Dispositions [Line Items]
Date Disposed	Dec. 31, 2013	[2]
Sales Price	1,900,000	[2]
Closing Adjustments	0	[2]
Mortgage Notes	0	[2]
Proceeds from sale of cost method investment in real estate	1,900,000	[2]
Net Real Estate Investment	1,400,000	[2]
Other (including receivables)	0	[2]
Gain/ (Impairment)	500,000	[2]
Square Footage	10,593	[2]
Alabama [Member] | Real estate dispositions [Member] | Inpatient Facility Disposed July 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	Jul. 31, 2013	[2]
Sales Price	17,500,000	[2]
Closing Adjustments	100,000	[2]
Mortgage Notes	0	[2]
Proceeds from sale of cost method investment in real estate	17,400,000	[2]
Net Real Estate Investment	11,200,000	[2]
Other (including receivables)	0	[2]
Gain/ (Impairment)	6,200,000	[2]
Square Footage	82,000	[2]
FLORIDA | Real estate dispositions [Member]
Real Estate Dispositions [Line Items]
Date Disposed	Oct. 31, 2013	[2]
Sales Price	800,000	[2]
Closing Adjustments	0	[2]
Mortgage Notes	0	[2]
Proceeds from sale of cost method investment in real estate	800,000	[2]
Net Real Estate Investment	800,000	[2]
Other (including receivables)	0	[2]
Gain/ (Impairment)	0	[2]
Square Footage	14,322	[2]
Impairment on sale	100,000
FLORIDA | Real estate dispositions [Member] | Medical Office Buidlings Disposed January 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Jan. 19, 2012	[2]
Sales Price			7,200,000	[2]
Closing Adjustments			1,500,000	[2]
Mortgage Notes			0	[2]
Proceeds from sale of cost method investment in real estate			5,700,000	[2]
Net Real Estate Investment			3,000,000	[2]
Other (including receivables)			200,000	[2]
Gain/ (Impairment)			2,500,000	[2]
Square Footage			35,752	[2]
FLORIDA | Real estate dispositions [Member] | Medical Office Buildings Disposed March 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Mar. 02, 2012	[2]
Sales Price			500,000	[2]
Closing Adjustments			0	[2]
Mortgage Notes			0	[2]
Proceeds from sale of cost method investment in real estate			500,000	[2]
Net Real Estate Investment			500,000	[2]
Other (including receivables)			0	[2]
Gain/ (Impairment)			0	[2]
Square Footage			33,895	[2]
Impairment on sale			1,700,000
FLORIDA | Real estate dispositions [Member] | Medical Office Buidlings Disposed April 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Apr. 18, 2012	[3]
Sales Price			33,300,000	[3]
Closing Adjustments			900,000	[3]
Mortgage Notes			3,700,000	[3]
Proceeds from sale of cost method investment in real estate			28,700,000	[3]
Net Real Estate Investment			31,200,000	[3]
Other (including receivables)			1,300,000	[3]
Gain/ (Impairment)			(100,000)	[3]
Square Footage			272,571	[3]
Number of properties included			5
Number of Medical Office Disposed Off Campus			4
Number of Medical Office Disposed On Campus			1
FLORIDA | Real estate dispositions [Member] | Medical Office Buildings Disposed August 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Aug. 22, 2012	[2]
Sales Price			500,000	[2]
Closing Adjustments			0	[2]
Mortgage Notes			0	[2]
Proceeds from sale of cost method investment in real estate			500,000	[2]
Net Real Estate Investment			900,000	[2]
Other (including receivables)			0	[2]
Gain/ (Impairment)			(400,000)	[2]
Square Footage			8,990	[2]
Impairment on sale			800,000
FLORIDA | Real estate dispositions [Member] | Medical Office Buildings Disposed September 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Sep. 14, 2012	[4]
Sales Price			8,800,000	[4]
Closing Adjustments			100,000	[4]
Mortgage Notes			0	[4]
Proceeds from sale of cost method investment in real estate			8,700,000	[4]
Net Real Estate Investment			10,800,000	[4]
Other (including receivables)			400,000	[4]
Gain/ (Impairment)			(2,500,000)	[4]
Square Footage			71,345	[4]
FLORIDA | Real estate dispositions [Member] | Medical Office Buildings Disposed December 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Dec. 17, 2012
Sales Price			2,100,000
Closing Adjustments			100,000
Mortgage Notes			0
Proceeds from sale of cost method investment in real estate			2,000,000
Net Real Estate Investment			9,700,000
Other (including receivables)			0
Gain/ (Impairment)			(7,700,000)
Square Footage			62,271
FLORIDA | Real estate dispositions [Member] | Inpatient Facility Disposed July 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	Jul. 15, 2013	[2]
Sales Price	11,900,000	[2]
Closing Adjustments	200,000	[2]
Mortgage Notes	0	[2]
Proceeds from sale of cost method investment in real estate	11,700,000	[2]
Net Real Estate Investment	7,400,000	[2]
Other (including receivables)	0	[2]
Gain/ (Impairment)	4,300,000	[2]
Square Footage	62,782	[2]
IOWA | Medical Building Disposed June 2013 [Member]
Real Estate Dispositions [Line Items]
Real Estate Dispositions Mortgage Note Receivable	1,100,000
Payments of Debt Extinguishment Costs	300,000
IOWA | Real estate dispositions [Member] | Medical Office Buildings Disposed December 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Dec. 12, 2012	[4]
Sales Price			8,000,000	[4]
Closing Adjustments			0	[4]
Mortgage Notes			0	[4]
Proceeds from sale of cost method investment in real estate			8,000,000	[4]
Net Real Estate Investment			6,700,000	[4]
Other (including receivables)			100,000	[4]
Gain/ (Impairment)			1,200,000	[4]
Square Footage			40,818	[4]
Number of properties sold			2
IOWA | Real estate dispositions [Member] | Medical Building Disposed June 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	Jun. 03, 2013	[4],[5]
Sales Price	6,900,000	[4],[5]
Closing Adjustments	0	[4],[5]
Mortgage Notes	0	[4],[5]
Proceeds from sale of cost method investment in real estate	6,900,000	[4],[5]
Net Real Estate Investment	5,300,000	[4],[5]
Other (including receivables)	200,000	[4],[5]
Gain/ (Impairment)	1,400,000	[4],[5]
Square Footage	31,725	[4],[5]
Number of properties sold	2
Real Estate Dispositions Mortgage Note Receivable	1,100,000
Payments of Debt Extinguishment Costs	300,000
IOWA | Iowa One [Member] | Real estate dispositions [Member] | Medical Building Disposed June 2013 [Member]
Real Estate Dispositions [Line Items]
Square Footage	9,153
IOWA | Iowa Two [Member] | Real estate dispositions [Member] | Medical Building Disposed June 2013 [Member]
Real Estate Dispositions [Line Items]
Square Footage	22,572
Tennessee [Member] | Building Disposed April 2013 [Member]
Real Estate Dispositions [Line Items]
Sales Price	600,000
Net Real Estate Investment	400,000
Square Footage	17,696
Deferred Gain on Disposition of Assets	200,000
Impairment on sale	1,300,000
Tennessee [Member] | Real estate dispositions [Member] | Building Disposed April 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	Apr. 30, 2013	[2],[6]
Sales Price	600,000	[2],[6]
Closing Adjustments	0	[2],[6]
Mortgage Notes	600,000	[2],[6]
Proceeds from sale of cost method investment in real estate	0	[2],[6]
Net Real Estate Investment	400,000	[2],[6]
Other (including receivables)	0	[2],[6]
Gain/ (Impairment)	200,000	[2],[6]
Square Footage	17,696	[2],[6]
Tennessee [Member] | Real estate dispositions [Member] | Medical Office Buidlings Disposed April 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Apr. 13, 2012	[2]
Sales Price			900,000	[2]
Closing Adjustments			100,000	[2]
Mortgage Notes			0	[2]
Proceeds from sale of cost method investment in real estate			800,000	[2]
Net Real Estate Investment			800,000	[2]
Other (including receivables)			0	[2]
Gain/ (Impairment)			0	[2]
Square Footage			18,476	[2]
Impairment on sale			900,000
TEXAS | Real estate dispositions [Member] | Land Disposed March 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	Mar. 25, 2013
Sales Price	5,000,000
Closing Adjustments	200,000
Mortgage Notes	3,700,000
Proceeds from sale of cost method investment in real estate	1,100,000
Net Real Estate Investment	8,100,000
Other (including receivables)	0
Gain/ (Impairment)	(3,300,000)
Square Footage	0
TEXAS | Real estate dispositions [Member] | Medical Office Buidlings Disposed January 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Jan. 10, 2012	[2],[4],[7]
Sales Price			3,500,000	[2],[4],[7]
Closing Adjustments			100,000	[2],[4],[7]
Mortgage Notes			3,000,000	[2],[4],[7]
Proceeds from sale of cost method investment in real estate			400,000	[2],[4],[7]
Net Real Estate Investment			2,500,000	[2],[4],[7]
Other (including receivables)			0	[2],[4],[7]
Gain/ (Impairment)			900,000	[2],[4],[7]
Square Footage			33,726	[2],[4],[7]
Number of properties sold			2
TEXAS | Real estate dispositions [Member] | Medical Office Buildings Disposed March 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Mar. 16, 2012	[2],[8]
Sales Price			4,700,000	[2],[8]
Closing Adjustments			200,000	[2],[8]
Mortgage Notes			4,500,000	[2],[8]
Proceeds from sale of cost method investment in real estate			0	[2],[8]
Net Real Estate Investment			4,800,000	[2],[8]
Other (including receivables)			100,000	[2],[8]
Gain/ (Impairment)			(400,000)	[2],[8]
Square Footage			82,664	[2],[8]
Impairment on sale			2,800,000
TEXAS | Real estate dispositions [Member] | Medical Office Buildings Disposed July 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Jul. 20, 2012	[2]
Sales Price			600,000	[2]
Closing Adjustments			100,000	[2]
Mortgage Notes			0	[2]
Proceeds from sale of cost method investment in real estate			500,000	[2]
Net Real Estate Investment			500,000	[2]
Other (including receivables)			0	[2]
Gain/ (Impairment)			0	[2]
Square Footage			16,578	[2]
Impairment on sale			400,000
TEXAS | Real estate dispositions [Member] | Medical Office Buildings Disposed August 2012 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			Aug. 27, 2012
Sales Price			21,400,000
Closing Adjustments			2,400,000
Mortgage Notes			0
Proceeds from sale of cost method investment in real estate			19,000,000
Net Real Estate Investment			12,000,000
Other (including receivables)			700,000
Gain/ (Impairment)			6,300,000
Square Footage			80,740
TEXAS | Real estate dispositions [Member] | Medical Building Disposed May 15 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	May 15, 2013
Sales Price	1,300,000
Closing Adjustments	100,000
Mortgage Notes	0
Proceeds from sale of cost method investment in real estate	1,200,000
Net Real Estate Investment	900,000
Other (including receivables)	0
Gain/ (Impairment)	300,000
Square Footage	8,000
TEXAS | Real estate dispositions [Member] | Medical Building Disposed May 24 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	May 24, 2013	[2]
Sales Price	3,200,000	[2]
Closing Adjustments	200,000	[2]
Mortgage Notes	0	[2]
Proceeds from sale of cost method investment in real estate	3,000,000	[2]
Net Real Estate Investment	3,000,000	[2]
Other (including receivables)	0	[2]
Gain/ (Impairment)	0	[2]
Square Footage	100,920	[2]
Impairment on sale	6,800,000
Medical Office Building One [Member] | FLORIDA | Real estate dispositions [Member] | Medical Office Buildings Disposed September 2012 [Member]
Real Estate Dispositions [Line Items]
Square Footage			61,763	[4]
Medical Office Building One [Member] | IOWA | Real estate dispositions [Member] | Medical Office Buildings Disposed December 2012 [Member]
Real Estate Dispositions [Line Items]
Square Footage			31,650
Medical Office Building One [Member] | TEXAS | Real estate dispositions [Member] | Medical Office Buidlings Disposed January 2012 [Member]
Real Estate Dispositions [Line Items]
Square Footage			14,748
Medical Office Building Two [Member] | FLORIDA | Real estate dispositions [Member] | Medical Office Buildings Disposed September 2012 [Member]
Real Estate Dispositions [Line Items]
Square Footage			9,582	[4]
Medical Office Building Two [Member] | IOWA | Real estate dispositions [Member] | Medical Office Buildings Disposed December 2012 [Member]
Real Estate Dispositions [Line Items]
Square Footage			9,168
Medical Office Building Two [Member] | TEXAS | Real estate dispositions [Member] | Medical Office Buidlings Disposed January 2012 [Member]
Real Estate Dispositions [Line Items]
Square Footage			18,978
Contingent Liability [Member] | FLORIDA | Real estate dispositions [Member] | Medical Office Buidlings Disposed April 2012 [Member]
Real Estate Dispositions [Line Items]
Closing Adjustments			600,000
Closing Cost [Member] | FLORIDA | Real estate dispositions [Member] | Medical Office Buidlings Disposed April 2012 [Member]
Real Estate Dispositions [Line Items]
Closing Adjustments			300,000
Closing Cost [Member] | TEXAS | Real estate dispositions [Member] | Medical Office Buildings Disposed August 2012 [Member]
Real Estate Dispositions [Line Items]
Closing Adjustments			400,000
Escrow for Tenant Improvements [Member] | TEXAS | Real estate dispositions [Member] | Medical Office Buildings Disposed August 2012 [Member]
Real Estate Dispositions [Line Items]
Closing Adjustments			$ 2,000,000

[1] "Other" includes construction liabilities transferred upon deconsolidation. "Gain" includes $0.4 million of net mortgage interest income recognized, partially offset by $0.1 million of general and administrative overhead expense that had been capitalized into the project that was reversed upon deconsolidation.

[2] Previously included in assets held for sale.

[3] Includes five properties.

[4] Includes two properties.

[5] The Company repaid a mortgage note payable of $1.1 million upon sale and incurred debt extinguishment costs of $0.3 million.

[6] The Company-financed mortgage note receivable was repaid in October 2013.

[7] The Company-financed mortgage note was repaid in November 2012.

[8] The Company-financed mortgage note was repaid in April 2012.