Commitments And Contingencies (Schedule of Rent Concessions) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Lease Payment Deferral [Member]
Operating Lease, Lease Income	$ 9,179
Lease Payment Deferral [Member] | Lease Payment Deferral 2020
Operating Lease, Lease Income	4,982
Lease Payment Deferral [Member] | Rent Deferred First Quarter of 2021
Operating Lease, Lease Income	4,197
Lease Payment Deferral [Member] | Bickford Senior Living [Member]
Operating Lease, Lease Income	7,500
Lease Payment Deferral [Member] | Bickford Senior Living [Member] | Lease Payment Deferral 2020
Operating Lease, Lease Income	3,750
Lease Payment Deferral [Member] | Bickford Senior Living [Member] | Rent Deferred First Quarter of 2021
Operating Lease, Lease Income	3,750
Lease Payment Deferral [Member] | Other Than Bickford
Operating Lease, Lease Income	1,679
Lease Payment Deferral [Member] | Other Than Bickford | Lease Payment Deferral 2020
Operating Lease, Lease Income	1,232
Lease Payment Deferral [Member] | Other Than Bickford | Rent Deferred First Quarter of 2021
Operating Lease, Lease Income	447
Lease Abatement [Member]
Operating Lease, Lease Income	2,150
Lease Abatement [Member] | Lease Abatement for 2020
Operating Lease, Lease Income	2,150
Lease Abatement [Member] | Rent Abated First Quarter of 2021
Operating Lease, Lease Income	0
Lease Abatement [Member] | Bickford Senior Living [Member]
Operating Lease, Lease Income	2,100
Lease Abatement [Member] | Bickford Senior Living [Member] | Lease Abatement for 2020
Operating Lease, Lease Income	2,100
Lease Abatement [Member] | Bickford Senior Living [Member] | Rent Abated First Quarter of 2021
Operating Lease, Lease Income	0
Lease Abatement [Member] | Other Than Bickford
Operating Lease, Lease Income	50
Lease Abatement [Member] | Other Than Bickford | Lease Abatement for 2020
Operating Lease, Lease Income	50
Lease Abatement [Member] | Other Than Bickford | Rent Abated First Quarter of 2021
Operating Lease, Lease Income	$ 0