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Related Person Transactions (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended			6 Months Ended						3 Months Ended		6 Months Ended		3 Months Ended		5 Months Ended		6 Months Ended			3 Months Ended	1 Months Ended				6 Months Ended	1 Months Ended	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Acquisition Five Star Senior living communities Rockford, Illinois	Jun. 30, 2011 Sale Five Star	Jun. 30, 2011 Five Star	Jun. 30, 2010 Five Star	Jun. 30, 2011 Five Star	Jun. 30, 2010 Five Star	Dec. 31, 2010 Five Star	Jul. 28, 2011 Five Star Senior living communities	Jun. 30, 2011 Five Star Senior living communities	Jun. 30, 2011 Five Star Rehabilitation hospitals	Jun. 30, 2011 RMR	Jun. 30, 2010 RMR	Jun. 30, 2011 RMR	Jun. 30, 2010 RMR	Jun. 30, 2011 AIC	Jun. 30, 2010 AIC	May 31, 2012 AIC	May 31, 2011 AIC	Jun. 30, 2011 AIC	Jun. 30, 2010 AIC	Dec. 31, 2010 AIC	Jul. 31, 2011 Acquisition	Jul. 31, 2011 Acquisition Senior living communities Five States in the Southeast United States	Jun. 30, 2011 Acquisition Senior living communities Five States in the Southeast United States	May 31, 2011 Acquisition Senior living communities Five States in the Southeast United States	Mar. 31, 2011 Acquisition Senior living communities Five States in the Southeast United States	Jun. 30, 2011 Acquisition Senior living communities Five States in the Southeast United States	May 31, 2011 Acquisition Senior living communities Rockford, Illinois	Jun. 30, 2011 Sale	Jun. 30, 2011 Sale Skilled nursing facilities Georgia	Jun. 30, 2011 Sale Assisted living community	Jun. 30, 2011 Sale Assisted living community Pennsylvania
Related person transactions
Investment in common shares (in shares)							4,235,000		4,235,000
Percentage of total shares outstanding (as a percent)							8.90%		8.90%
Number of Managing Trustees also serving as managing directors							1		1
Number of real estate properties leased													187	2
Minimum annual rent payable to entity					$ 608				$ 192,915																						$ 6,923
Total rent recognized							46,789	46,220	93,483	92,310
Rents receivable							16,815		16,815		16,762
Number of properties agreed to be acquired																														20	3
Amount outstanding under Bridge Loan												24,000	9,000
Number of states in which properties are located	37		37																											5
Aggregate purchase price of properties acquired, excluding closing costs																										22,725	44,671	196,594		304,000		7,500
Number of properties acquired																											3	14				1
Mortgage loans assumed in real estate acquisition	(48,062)		(48,062)	(2,458)																								48,062
Interest and other income	254	243	509	500			58
Mortgage loans expected to be assumed in real estate acquisition																										9,700
Number of properties agreed to be acquired, referred as managed properties																													15
Number of properties agreed to be acquired, referred as leased properties																											5
Number of properties acquired, referred as managed properties																											2
Number of units																																73		329		70
Real estate improvements purchased							4,485		15,322
Increase or decrease in annual lease rent payable						(1,864)	359		1,228
Number of properties sold																																	7	3	1	1
Aggregate sale price						18,800																											39,460
Business management agreement expense															5,572	4,187	10,390	8,405
Property management agreement expense							25								1,057	551	2,081	1,104
Equity method investments, ownership percentage (as a percent)																			14.29%				14.29%
The entity owns less than this percentage of an equity method investment																			20.00%				20.00%
Amount invested in equity investee																			5,209				5,209
Equity method investments, carrying value																			5,202				5,202		5,076
Earnings and losses recognized related to equity investments	46	(24)	83	(52)															46	(24)			83	(52)
Total premiums																					$ 1,170	$ 275

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- Definition

The entity owns less than this percentage of an equity method investment.

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