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Fair Value Measurements - Financial Instruments at Fair Value (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of mortgage loans (in loan) | loan	10
Fair Value | Mortgages | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	$ 1,011,635	$ 1,016,565
Fair Value | Mortgages | BOA Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	354,417	355,823
Fair Value | Mortgages | BOA/KeyBank Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	262,283	263,454
Fair Value | Mortgages | AIG Loan II | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	120,491	121,011
Fair Value | Mortgages | AIG Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	101,596	102,033
Fair Value | Mortgages | Midland Mortgage Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	97,600	97,709
Fair Value | Mortgages | Samsonite Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	20,603	21,030
Fair Value | Mortgages | HealthSpring Mortgage Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	20,204	20,462
Fair Value | Mortgages | CCIT II Properties | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	18,767	18,942
Fair Value | Mortgages | Highway 94 Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	14,148	14,447
Fair Value | Mortgages | Emporia Partners Mortgage Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	1,526	1,654
Carrying Value | Mortgages
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	1,026,675	1,029,093
Carrying Value | Mortgages | BOA Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	375,000	375,000
Carrying Value | Mortgages | BOA/KeyBank Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	250,000	250,000
Carrying Value | Mortgages | AIG Loan II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	126,241	126,792
Carrying Value | Mortgages | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	103,383	103,870
Carrying Value | Mortgages | Midland Mortgage Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	97,619	98,155
Carrying Value | Mortgages | Samsonite Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	19,908	20,165
Carrying Value | Mortgages | HealthSpring Mortgage Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	20,073	20,208
Carrying Value | Mortgages | CCIT II Properties
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	18,496	18,587
Carrying Value | Mortgages | Highway 94 Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	14,453	14,689
Carrying Value | Mortgages | Emporia Partners Mortgage Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	$ 1,502	$ 1,627

X

- Definition

Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 3
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 3))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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+ References

No definition available.

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