Real Estate Investments - Dispositions (Details) (USD $)	9 Months Ended		1 Months Ended				3 Months Ended	1 Months Ended			1 Months Ended				0 Months Ended		1 Months Ended							1 Months Ended
	Sep. 30, 2013 sqft	Sep. 30, 2012	Mar. 31, 2013 TEXAS Land Disposed March 2013 acre	May 31, 2013 TEXAS Medical Building Disposed May 15, 2013 sqft	May 31, 2013 TEXAS Medical Building Disposed May 24, 2013 sqft		Mar. 31, 2013 TEXAS Medical Building Disposed May 24, 2013	Apr. 30, 2013 TENNESSEE Building Disposed April 2013 sqft		Sep. 30, 2013 TENNESSEE Building Disposed April 2013	Jun. 30, 2013 IOWA Medical Building Disposed June 2013 property sqft		Jul. 31, 2013 FLORIDA Inpatient Facility Disposed July 2013 sqft		Jul. 31, 2013 ALABAMA Inpatient Facility Disposed July 2013 sqft		Jul. 31, 2013 ALABAMA Inpatient Facility Disposed July 2013 sqft		Sep. 30, 2013 PENNSYLVANIA Inpatient Facility Disposed September 2013 property Purchase_options sqft	Mar. 31, 2013 First Year Mortgage Loan Receivable Due March 2015 TEXAS Land Disposed March 2013	Mar. 31, 2013 Second Year Mortgage Loan Receivable Due March 2015 TEXAS Land Disposed March 2013	Jun. 30, 2013 Iowa property 1 IOWA Medical Building Disposed June 2013 sqft	Jun. 30, 2013 Iowa property 2 IOWA Medical Building Disposed June 2013 sqft	Sep. 30, 2013 Inpatient Rehabilitation Facility One PENNSYLVANIA Inpatient Facility Disposed September 2013 sqft	Sep. 30, 2013 Inpatient Rehabilition Facility Two PENNSYLVANIA Inpatient Facility Disposed September 2013 sqft
Dispositions
Sales Price	$ 81,600,000		$ 5,000,000	$ 1,300,000	$ 3,200,000	[1]		$ 600,000	[1]		$ 6,900,000	[2],[3]	$ 11,900,000	[1]	$ 17,500,000	[1]	$ 17,500,000	[1]	$ 35,200,000					$ 17,600,000	$ 17,600,000
Closing Adjustments	(1,500,000)		(200,000)	(100,000)	(200,000)	[1]		0	[1]		0	[2],[3]	(200,000)	[1]	(100,000)	[1]	(100,000)	[1]	(700,000)					(300,000)	(400,000)
Company-Financed Mortgage Notes	(4,300,000)		(3,700,000)					(600,000)	[1]
Net Proceeds	75,800,000		1,100,000	1,200,000	3,000,000	[1]		0	[1]		6,900,000	[2],[3]	11,700,000	[1]			17,400,000	[1]	34,500,000					17,300,000	17,200,000
Net Real Estate Investment	61,100,000		8,100,000	900,000	3,000,000	[1]		400,000	[1]		5,300,000	[2],[3]	7,400,000	[1]	11,200,000	[1]	11,200,000	[1]	24,800,000					12,200,000	12,600,000
Write off of straight-line rent receivable	100,000										100,000
Gain/ (Impairment)	18,700,000		(3,300,000)	300,000	0	[1]		0	[1]		1,500,000	[2],[3]	4,300,000	[1]	6,200,000		6,200,000	[1]	9,700,000					5,100,000	4,600,000
Square Footage	459,007		15.1	8,000	100,920	[1]		17,696	[1]		31,725	[2],[3]	62,782	[1]	82,000	[1]	82,000	[1]	155,884			9,153	22,572	76,324	79,560
Number of Purchase Options Exercised																			2
Other details
Interest rate on Company-financed mortgage note								7.50%												5.00%	6.00%
Deferred gain on disposition of assets								200,000		0
Impairment of real estate	9,889,000	7,197,000					300,000
Number of properties sold											2								2
Mortgage note payable repaid on disposition											1,100,000
Debt extinguishment costs incurred											$ 300,000

[1] Previously included in assets held for sale.

[2] Includes two properties.

[3] Repaid a mortgage note payable of $1.1 million upon sale and incurred debt extinguishment costs of $0.3 million.