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Fair Value Measurements - Financial Instruments at Fair Value (Details) - Mortgages - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value | AIG Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	$ 99,985	$ 101,663
Fair Value | Midland | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	98,042	99,318
Fair Value | Highway 94 loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	14,747	15,101
Fair Value | BOA | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	352,959	369,343
Fair Value | AIG Loan II | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	117,805	122,258
Fair Value | BOA/KeyBank Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	256,581	264,101
Carrying Value | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	105,298	105,762
Carrying Value | Midland
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	99,733	100,249
Carrying Value | Highway 94 loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	15,383	15,610
Carrying Value | BOA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	375,000	375,000
Carrying Value | AIG Loan II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	126,970	126,970
Carrying Value | BOA/KeyBank Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	$ 250,000	$ 250,000

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- 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=118260190&loc=d3e13433-108611

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- Definition

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+ References

No definition available.

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