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Commitments And Contingencies (Narratives) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) properties	Dec. 31, 2019 USD ($) beds_or_units	Dec. 31, 2018 USD ($)
Maximum Commitment For All Active Development Projects	$ 53,945,000
Development in Process	$ 48,790,000
Number of Real Estate Properties | properties	228
Real Estate Investment Property, at Cost	$ 3,265,070,000	$ 3,074,846,000
Straight Line Rent	20,411,000	22,084,000	$ 22,787,000
Bickford Senior Living [Member]
Straight Line Rent	2,764,000	4,531,000	5,028,000
Bickford Senior Living [Member] | Negotiations to sale [Member]
Operating Lease, Lease Income	$ (7,878,000)	(9,383,000)	(8,859,000)
Number of Real Estate Properties | properties	9
Real Estate Investment Property, at Cost	$ 76,658,000
Straight Line Rent	(283,000)	$ (680,000)	$ (331,000)
Discovery PropCo [Member] | Capital Addition Purchase Commitments [Member]
Maximum Commitment For All Active Development Projects	2,000,000
Development in Process	$ 968,000
Non-Performing Lease [Member]
Number of Real Estate Properties | beds_or_units		9
Settlement Term	five
Lease Payment Deferral [Member] | Bickford Senior Living [Member]
Operating Lease, Lease Income	$ (5,850,000)
Lease Payment Deferral [Member] | Bickford Senior Living [Member] | Lease Payment Deferral 2021 [Member]
Operating Lease, Lease Income	(750,000)
Lease Payment Deferral [Member] | Bickford Senior Living [Member] | Rent deferred third quarter of 2020 [Member]
Operating Lease, Lease Income	(2,100,000)
Lease Payment Deferral [Member] | Bickford Senior Living [Member] | Rent deferred third quarter of 2020 [Member] | Negotiations to sale [Member]
Operating Lease, Lease Income	(182,000)
Lease Payment Deferral [Member] | Bickford Senior Living [Member] | Rent deferred fourth quarter of 2020 [Member]
Operating Lease, Lease Income	(3,750,000)
Lease Payment Deferral [Member] | Discovery Senior Living [Member]
Operating Lease, Lease Income	(1,072,000)
Lease Payment Deferral [Member] | Discovery Senior Living [Member] | Lease Payment Deferral 2021 [Member]
Operating Lease, Lease Income	(447,000)
Lease Payment Deferral [Member] | Discovery Senior Living [Member] | Rent deferred third quarter of 2020 [Member]
Operating Lease, Lease Income	(534,000)
Lease Payment Deferral [Member] | Discovery Senior Living [Member] | Rent deferred fourth quarter of 2020 [Member]
Operating Lease, Lease Income	(538,000)
Lease Abatement [Member] | Discovery Senior Living [Member]
Operating Lease, Lease Income	(50,000)
Lease Abatement [Member] | Discovery Senior Living [Member] | Rent abatement third quarter of 2020 [Member]
Operating Lease, Lease Income	(20,000)
Lease Abatement [Member] | Discovery Senior Living [Member] | Rent abatement fourth quarter of 2020 [Member]
Operating Lease, Lease Income	$ (30,000)
Initial Interest Rate [Member] | Bickford Senior Living [Member]
Deferred Lease Payments, Accrual Interest Rate	8.00%
Interest rate post December 31, 2021 [Member] | Discovery Senior Living [Member]
Deferred Lease Payments, Accrual Interest Rate	9.00%

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