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Real Estate Properties - Schedule of Senior Living Community Acquisitions (Details) $ in Thousands		1 Months Ended					12 Months Ended
	Nov. 09, 2017 USD ($) property	Dec. 31, 2016 USD ($) living_unit community	Jun. 30, 2016 USD ($) property	Sep. 30, 2015 USD ($) living_unit	May 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2017 USD ($) living_unit property	Dec. 31, 2016 USD ($) living_unit property	Dec. 31, 2015 USD ($) living_unit property	Nov. 30, 2017 pooling_agreement	Jun. 29, 2016 community	Feb. 28, 2016 USD ($) management_agreement
Real Estate [Line Items]
Acquired Real Estate Leases		$ 775,935					$ 791,067	$ 775,935
Assumed Debt							$ 0	$ 0	$ (181,433)
Senior Living Communities | 4 States
Real Estate [Line Items]
Number of Properties | property			7
Cash paid plus assumed debt			$ 112,350
Acquisitions | Senior Living Communities
Real Estate [Line Items]
Number of Properties | property								10	39
Units | living_unit		709		84				709	3,563
Cash paid plus assumed debt								$ 139,494	$ 818,236
Acquired Real Estate Leases		$ 3,723						3,723	130,305
Other Liabilities		$ 0						0	(18,091)
Assumed Debt								0	(151,477)
(Premium)/Discount on Assumed Debt								$ 0	$ (858)
Purchase price excluding closing costs				$ 18,250	$ 9,750
Loans Assumed	$ 33,700
Acquisitions | Senior Living Communities | Managed
Real Estate [Line Items]
Other Liabilities												$ (1,000)
Number of management agreements | management_agreement												1
Acquisitions | Senior Living Communities | 2 States | Managed
Real Estate [Line Items]
Number of Properties | property							2
Units | living_unit							229
Cash paid plus assumed debt							$ 39,457
Acquired Real Estate Leases							7,774
Other Liabilities							0
Assumed Debt							0
(Premium)/Discount on Assumed Debt							0
Acquisitions | Senior Living Communities | Georgia | Managed
Real Estate [Line Items]
Number of Properties | property								1	0
Units | living_unit		38						38	40
Cash paid plus assumed debt								$ 8,400	$ 9,750
Acquired Real Estate Leases		$ 1,400						1,400	161
Other Liabilities		$ 0						0	0
Assumed Debt								0	0
(Premium)/Discount on Assumed Debt								$ 0	$ 0
Acquisitions | Senior Living Communities | Georgia | Leased
Real Estate [Line Items]
Number of Properties | property									1
Units | living_unit									84
Cash paid plus assumed debt									$ 18,409
Acquired Real Estate Leases									0
Other Liabilities									0
Assumed Debt									0
(Premium)/Discount on Assumed Debt									$ 0
Acquisitions | Senior Living Communities | 4 States | Leased
Real Estate [Line Items]
Number of Properties | property								7
Units | living_unit		545						545
Cash paid plus assumed debt								$ 112,493
Acquired Real Estate Leases		$ 0						0
Other Liabilities		$ 0						0
Assumed Debt								0
(Premium)/Discount on Assumed Debt								$ 0
Acquisitions | Senior Living Communities | Illinois | Leased
Real Estate [Line Items]
Number of Properties | property								2
Units | living_unit		126						126
Cash paid plus assumed debt								$ 18,601
Acquired Real Estate Leases		$ 2,323						2,323
Other Liabilities		$ 0						0
Assumed Debt								0
(Premium)/Discount on Assumed Debt								0
Acquisitions | Senior Living Communities | 11 States | Leased
Real Estate [Line Items]
Number of Properties | property									18
Units | living_unit									2,119
Cash paid plus assumed debt									$ 459,184
Acquired Real Estate Leases									54,096
Other Liabilities									(18,091)
Assumed Debt									(44,395)
(Premium)/Discount on Assumed Debt									$ (1,125)
Acquisitions | Senior Living Communities | 5 States | Managed
Real Estate [Line Items]
Number of Properties | property									19
Units | living_unit									1,233
Cash paid plus assumed debt									$ 313,345
Acquired Real Estate Leases									73,840
Other Liabilities									0
Assumed Debt									(94,785)
(Premium)/Discount on Assumed Debt									$ 832
Acquisitions | Senior Living Communities | NC | Leased
Real Estate [Line Items]
Number of Properties | property									1
Units | living_unit									87
Cash paid plus assumed debt									$ 17,548
Acquired Real Estate Leases									2,208
Other Liabilities									0
Assumed Debt									(12,297)
(Premium)/Discount on Assumed Debt									$ (565)
Acquisitions | Senior Living Community Subtotal
Real Estate [Line Items]
Number of Properties | property									38
Units | living_unit									3,439
Cash paid plus assumed debt									$ 790,077
Acquired Real Estate Leases									130,144
Other Liabilities									(18,091)
Assumed Debt						$ (151,477)			(151,477)
(Premium)/Discount on Assumed Debt									(858)
Land | Acquisitions | Senior Living Communities
Real Estate [Line Items]
Property plant and equipment acquired								13,226	47,589
Land | Acquisitions | Senior Living Communities | 2 States | Managed
Real Estate [Line Items]
Property plant and equipment acquired							4,055
Land | Acquisitions | Senior Living Communities | Georgia | Managed
Real Estate [Line Items]
Property plant and equipment acquired								327	993
Land | Acquisitions | Senior Living Communities | Georgia | Leased
Real Estate [Line Items]
Property plant and equipment acquired									3,479
Land | Acquisitions | Senior Living Communities | 4 States | Leased
Real Estate [Line Items]
Property plant and equipment acquired								11,085
Land | Acquisitions | Senior Living Communities | Illinois | Leased
Real Estate [Line Items]
Property plant and equipment acquired								1,814
Land | Acquisitions | Senior Living Communities | 11 States | Leased
Real Estate [Line Items]
Property plant and equipment acquired									29,716
Land | Acquisitions | Senior Living Communities | 5 States | Managed
Real Estate [Line Items]
Property plant and equipment acquired									12,267
Land | Acquisitions | Senior Living Communities | NC | Leased
Real Estate [Line Items]
Property plant and equipment acquired									1,134
Land | Acquisitions | Senior Living Community Subtotal
Real Estate [Line Items]
Property plant and equipment acquired									43,117
Buildings and Improvements | Acquisitions | Senior Living Communities
Real Estate [Line Items]
Property plant and equipment acquired								114,512	623,474
Buildings and Improvements | Acquisitions | Senior Living Communities | 2 States | Managed
Real Estate [Line Items]
Property plant and equipment acquired							26,424
Buildings and Improvements | Acquisitions | Senior Living Communities | Georgia | Managed
Real Estate [Line Items]
Property plant and equipment acquired								6,195	8,169
Buildings and Improvements | Acquisitions | Senior Living Communities | Georgia | Leased
Real Estate [Line Items]
Property plant and equipment acquired									14,021
Buildings and Improvements | Acquisitions | Senior Living Communities | 4 States | Leased
Real Estate [Line Items]
Property plant and equipment acquired								94,940
Buildings and Improvements | Acquisitions | Senior Living Communities | Illinois | Leased
Real Estate [Line Items]
Property plant and equipment acquired								13,377
Buildings and Improvements | Acquisitions | Senior Living Communities | 11 States | Leased
Real Estate [Line Items]
Property plant and equipment acquired									373,471
Buildings and Improvements | Acquisitions | Senior Living Communities | 5 States | Managed
Real Estate [Line Items]
Property plant and equipment acquired									214,064
Buildings and Improvements | Acquisitions | Senior Living Communities | NC | Leased
Real Estate [Line Items]
Property plant and equipment acquired									13,749
Buildings and Improvements | Acquisitions | Senior Living Community Subtotal
Real Estate [Line Items]
Property plant and equipment acquired									601,284
Furniture, fixtures and equipment | Acquisitions | Senior Living Communities
Real Estate [Line Items]
Property plant and equipment acquired								8,033	35,817
Furniture, fixtures and equipment | Acquisitions | Senior Living Communities | 2 States | Managed
Real Estate [Line Items]
Property plant and equipment acquired							$ 1,204
Furniture, fixtures and equipment | Acquisitions | Senior Living Communities | Georgia | Managed
Real Estate [Line Items]
Property plant and equipment acquired								478	427
Furniture, fixtures and equipment | Acquisitions | Senior Living Communities | Georgia | Leased
Real Estate [Line Items]
Property plant and equipment acquired									909
Furniture, fixtures and equipment | Acquisitions | Senior Living Communities | 4 States | Leased
Real Estate [Line Items]
Property plant and equipment acquired								6,468
Furniture, fixtures and equipment | Acquisitions | Senior Living Communities | Illinois | Leased
Real Estate [Line Items]
Property plant and equipment acquired								$ 1,087
Furniture, fixtures and equipment | Acquisitions | Senior Living Communities | 11 States | Leased
Real Estate [Line Items]
Property plant and equipment acquired									21,117
Furniture, fixtures and equipment | Acquisitions | Senior Living Communities | 5 States | Managed
Real Estate [Line Items]
Property plant and equipment acquired									12,342
Furniture, fixtures and equipment | Acquisitions | Senior Living Communities | NC | Leased
Real Estate [Line Items]
Property plant and equipment acquired									1,022
Furniture, fixtures and equipment | Acquisitions | Senior Living Community Subtotal
Real Estate [Line Items]
Property plant and equipment acquired									$ 34,481
Five Star | Senior Living Communities
Real Estate [Line Items]
Number of management agreements | community											10
Five Star | Senior Living Communities | Illinois
Real Estate [Line Items]
Number of Properties | community		2
Cash paid plus assumed debt		$ 18,600
Five Star | Acquisitions | Senior Living Communities
Real Estate [Line Items]
Number of Properties | property	6
Number of management agreements | pooling_agreement										2
Purchase price excluding closing costs	$ 104,000

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The fair value of loans assumed in noncash investing or financing activities.

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