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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

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