Investment Activity (Schedule of Fixed and Variable Lease Payments) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fixed and Variable Lease Payments [Line Items]
Rental income	$ 59,394	$ 67,043	$ 163,935	$ 210,143
Straight-line rental income			(11,360)	12,189
Lease payments based on fixed escalators, net of deferrals
Fixed and Variable Lease Payments [Line Items]
Rental income	53,394	59,027	172,767	188,008
Lease payments based on variable escalators
Fixed and Variable Lease Payments [Line Items]
Rental income	1,224	1,288	2,452	3,201
Straight-line rent income
Fixed and Variable Lease Payments [Line Items]
Straight-line rental income	2,476	3,798	(11,360)	12,189
Escrow funds received from tenants for property operating expenses
Fixed and Variable Lease Payments [Line Items]
Rental income	2,358	3,182	7,553	7,519
Amortization and write-off of lease incentives
Fixed and Variable Lease Payments [Line Items]
Amortization and write-off of lease incentives	$ (58)	$ (252)	$ (7,477)	$ (774)

Schedule of Fixed and Variable Lease Payments

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- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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- Definition

Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981

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- Definition

Difference between actual rental income due and rental income recognized on a straight-line basis.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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