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Real Estate Investments - Schedule of Disposal Groups (Details) $ in Thousands	1 Months Ended																						12 Months Ended
	Apr. 30, 2021 USD ($) building	Feb. 28, 2021 USD ($) ft² building	Dec. 31, 2020 USD ($) ft² property unit building	Nov. 30, 2020 USD ($) building unit	Oct. 31, 2020 USD ($) building unit	Sep. 30, 2020 USD ($) ft² building	Aug. 31, 2020 USD ($) building unit	Jul. 31, 2020 USD ($) ft² building	Jun. 30, 2020 USD ($) ft² building	Apr. 30, 2020 USD ($) building unit	Mar. 31, 2020 USD ($) ft² building	Feb. 29, 2020 USD ($)	Jan. 31, 2020 USD ($) ft² building	Dec. 31, 2019 USD ($) ft² building property unit	Oct. 31, 2019 USD ($) ft² building unit	Sep. 30, 2019 USD ($) ft² building property unit	Aug. 31, 2019 USD ($) ft² building	Jul. 31, 2019 USD ($) ft² building	Jun. 30, 2019 USD ($) ft² building	May 31, 2019 USD ($) ft² building unit	Mar. 31, 2019 USD ($) ft² building	Feb. 28, 2019 USD ($) ft² building	Dec. 31, 2021 USD ($) ft² property building	Dec. 31, 2020 USD ($) ft² property unit building	Dec. 31, 2019 USD ($) ft² building property unit	Feb. 28, 2020 ft² building
Real Estate
Number of Properties | property																							390
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Real Estate
Number of Properties | building			27											46									5	27	46
Sales Price																							$ 104,500	$ 152,893	$ 260,783
Gain (loss) on Sale																							$ 30,638	$ 6,262	$ 39,696
Medical Office
Real Estate
Number of Properties | property			7											20										7	20
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Real Estate
Number of Properties | property			4																					4
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Pennsylvania
Real Estate
Number of Properties | building		1																								1
Area of real estate properties (in square feet) | ft²		92,000																								50,000
Sales Price		$ 9,000										$ 2,900
Gain (loss) on Sale		$ (122)										$ 0
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Louisiana
Real Estate
Number of Properties | building													6
Area of real estate properties (in square feet) | ft²													40,575
Sales Price													$ 5,925
Gain (loss) on Sale													$ (81)
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Texas
Real Estate
Number of Properties | building								1			1
Area of real estate properties (in square feet) | ft²								6,849			70,229
Sales Price								$ 2,072			$ 8,779
Gain (loss) on Sale								$ (30)			$ 2,863
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | South Carolina
Real Estate
Number of Properties | building									1
Area of real estate properties (in square feet) | ft²									49,242
Sales Price									$ 3,550
Gain (loss) on Sale									$ 0
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Connecticut
Real Estate
Number of Properties | building								1
Area of real estate properties (in square feet) | ft²								32,162
Sales Price								$ 625
Gain (loss) on Sale								$ (25)
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Mississippi
Real Estate
Number of Properties | building						1
Area of real estate properties (in square feet) | ft²						78,747
Sales Price						$ 7,250
Gain (loss) on Sale						$ (114)
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | New York
Real Estate
Number of Properties | building			1																					1
Area of real estate properties (in square feet) | ft²			64,060																					64,060
Sales Price			$ 3,875
Gain (loss) on Sale			$ (273)
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Massachusetts
Real Estate
Number of Properties | building																1	1	3	7		1
Area of real estate properties (in square feet) | ft²																41,065	49,357	103,484	164,121		4,400
Sales Price																$ 2,750	$ 2,221	$ 4,955	$ 8,042		$ 75
Gain (loss) on Sale																$ 1,044	$ 812	$ 2,332	$ 1,590		$ (58)
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Colorado
Real Estate
Number of Properties | building																				1
Area of real estate properties (in square feet) | ft²																				15,647
Sales Price																				$ 2,590
Gain (loss) on Sale																				$ 1,029
Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Georgia
Real Estate
Number of Properties | building														1											1
Area of real estate properties (in square feet) | ft²														95,010											95,010
Sales Price														$ 14,000
Gain (loss) on Sale														$ (63)
Life Science / Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Florida
Real Estate
Number of Properties | building	4
Area of real estate properties (in square feet) | ft²																							263,656
Sales Price	$ 95,500
Gain (loss) on Sale	$ 30,760
IL / AL | Disposal Group, Disposed of by Sale, Not Discontinued Operations | California
Real Estate
Number of Properties | building										3
Number of units in real estate property | unit										599
Sales Price										$ 47,000
Gain (loss) on Sale										$ (256)
AL | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Mississippi
Real Estate
Number of Properties | building							2
Number of units in real estate property | unit							116
Sales Price							$ 2,500
Gain (loss) on Sale							$ (42)
AL | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Various
Real Estate
Number of Properties | building					3									7											7
Number of units in real estate property | unit					239									566											566
Sales Price					$ 46,000									$ 103,250
Gain (loss) on Sale					$ 4,292									$ 3,593
AL | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Nebraska
Real Estate
Number of Properties | building				1
Number of units in real estate property | unit				131
Sales Price				$ 3,000
Gain (loss) on Sale				$ (26)
Life Science
Real Estate
Number of Properties | property														1											1
Life Science | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Florida
Real Estate
Number of Properties | building																						1
Area of real estate properties (in square feet) | ft²																						60,396
Sales Price																						$ 2,900
Gain (loss) on Sale																						$ (69)
Life Science | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Ohio
Real Estate
Number of Properties | building			2																					2
Area of real estate properties (in square feet) | ft²			232,016																					232,016
Sales Price			$ 7,917
Gain (loss) on Sale			$ 257
Life Science | Disposal Group, Disposed of by Sale, Not Discontinued Operations | New Jersey
Real Estate
Number of Properties | building															1
Area of real estate properties (in square feet) | ft²															205,439
Sales Price															$ 47,500
Gain (loss) on Sale															$ 0
SNF / AL | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Wisconsin
Real Estate
Number of Properties | building			3																					3
Number of units in real estate property | unit			537																					537
Sales Price			$ 11,500
Gain (loss) on Sale			$ (303)
SNF / AL | Disposal Group, Disposed of by Sale, Not Discontinued Operations | South Dakota
Real Estate
Number of Properties | building															3
Number of units in real estate property | unit															245
Sales Price															$ 10,500
Gain (loss) on Sale															$ 6,661
SNF | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Real Estate
Number of Properties | property																							8
Number of units in real estate property | property																15
SNF | Disposal Group, Disposed of by Sale, Not Discontinued Operations | California
Real Estate
Number of Properties | building																				3
Number of units in real estate property | unit																				278
Sales Price																				$ 21,500
Gain (loss) on Sale																				$ 15,207
SNF | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Various
Real Estate
Number of Properties | building																15
Number of units in real estate property | unit																964
Sales Price																$ 8,000
Gain (loss) on Sale																$ 0
IL | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Washington
Real Estate
Number of Properties | building														1											1
Number of units in real estate property | unit														150											150
Sales Price														$ 32,500
Gain (loss) on Sale														$ 7,618

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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