Acquisitions, Dispositions, and Mortgage Funding (Details 2) (USD $)	6 Months Ended			1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended		1 Months Ended		6 Months Ended				6 Months Ended								0 Months Ended		0 Months Ended
	Jun. 30, 2013 sqft	Jun. 30, 2012	Dec. 31, 2012	Mar. 31, 2013 TEXAS Land Disposed March 2013 acre	Jun. 30, 2013 TEXAS Land Disposed March 2013	May 31, 2013 TEXAS Medical Building Disposed May 15, 2013 sqft	Jun. 30, 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	Jun. 30, 2013 TEXAS Medical Building Disposed May 24, 2013 sqft		Jun. 30, 2013 IOWA Medical Building Disposed June 2013 property sqft		Jun. 30, 2013 IOWA Medical Building Disposed June 2013 property sqft		Jun. 30, 2013 Iowa property 1 Medical Building Disposed June 2013 sqft	Jun. 30, 2013 Iowa property 2 Medical Building Disposed June 2013 sqft	Jun. 30, 2013 TENNESSEE Building Disposed April 2013 sqft		Apr. 30, 2013 TENNESSEE Building Disposed April 2013 sqft	Apr. 30, 2013 PENNSYLVANIA Inpatient Rehabilitation Hospital Potential Disposition September 2013 [Member] hospital	Jun. 30, 2013 Mortgage Loan Receivable Due March 2015 TEXAS Land Disposed March 2013	Mar. 31, 2013 Mortgage Loan Receivable Due March 2015 TEXAS Land Disposed March 2013	Jun. 30, 2013 Mortgage Loan Receivable Due April 2018 TENNESSEE Building Disposed April 2013		Jul. 15, 2013 Subsequent Event FLORIDA Inpatient Facility Disposed July 2013 [Member]	Jun. 30, 2013 Subsequent Event FLORIDA Inpatient Facility Disposed July 2013 [Member]	Jul. 31, 2013 Subsequent Event ALABAMA Inpatient Facility Disposed July 2013 [Member]	Jun. 30, 2013 Subsequent Event ALABAMA Inpatient Facility Disposed July 2013 [Member]	Mar. 31, 2013 First Year [Member] Mortgage Loan Receivable Due March 2015 TEXAS Land Disposed March 2013	Mar. 31, 2013 Second Year [Member] Mortgage Loan Receivable Due March 2015 TEXAS Land Disposed March 2013
Dispositions
Sales Price	$ 17,000,000			$ 5,000,000	$ 5,000,000	$ 1,300,000	$ 1,300,000	$ 3,200,000		$ 3,200,000	[1]	$ 6,900,000	[2],[3]	$ 6,900,000	[2],[3]			$ 600,000	[1]	$ 600,000						$ 11,900,000		$ 17,500,000
Closing Adjustments	(500,000)			(200,000)	(200,000)	(100,000)	(100,000)	(200,000)		(200,000)	[1]	0	[2],[3]	0	[2],[3]			0	[1]
Notes Receviable, Interest Rate, Stated Percentage																														5.00%	6.00%
Company-Financed Mortgage Notes	(4,300,000)																					(3,700,000)	(3,700,000)	(600,000)	[1]
Net Proceeds	12,200,000			1,100,000	1,100,000	1,200,000	1,200,000	3,000,000		3,000,000	[1]			6,900,000	[2],[3]			0	[1]
Net Real Estate Investment	17,700,000			8,100,000	8,100,000	900,000	900,000	3,000,000		3,000,000	[1]	5,300,000	[2],[3]	5,300,000	[2],[3]			400,000	[1]	400,000						7,400,000		11,200,000
Base Rent Per Prior Quarter																											400,000		600,000
Gain/ (Impairment)	(1,500,000)			(3,300,000)	(3,300,000)	300,000	300,000			0	[1]	1,500,000		1,500,000	[2],[3]			0	[1]							4,300,000		6,200,000
Square Footage	158,341			15.1		8,000	8,000	100,920		100,920	[1]	31,725	[2],[3]	31,725	[2],[3]	9,153	22,572	17,696	[1]	17,696
Other details
Interest rate on Company-financed mortgage note																				7.50%
Deferred gain on disposition of assets																				200,000
Impairment of real estate	3,630,000	4,336,000							300,000
Number of properties sold												2		2
Mortgage note payable repaid on disposition												1,100,000		1,100,000
Debt extinguishment costs incurred												300,000		300,000
Write off of straight-line rent receivable	100,000											100,000		100,000
Leased properties, purchase option, lease base rent per quarter																					1,300,000
Number of Leased Properties, Lessee Purchase Options																					2
Total real estate properties, net	2,214,043,000		2,240,706,000																		24,900,000
Leased Properties, Lessee Purchase Options, Minimum Purchase Price																					$ 17,600,000

[1] Previously included in assets held for sale.

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

[3] Includes two properties.