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Fair Value Measurements - Financial Instruments at Fair Value (Details) - Mortgages - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value | Samsonite | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	$ 22,627	$ 22,440
Fair Value | Highway 94 loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	15,490	15,601
Fair Value | AIG Loan II | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	121,336	0
Fair Value | BOA Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	369,054	361,917
Fair Value | BOA/KeyBank Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	264,824	0
Fair Value | AIG Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	104,172	108,032
Carrying Value | Samsonite
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	21,626	22,085
Carrying Value | Highway 94 loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	16,058	16,497
Carrying Value | AIG Loan II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	126,970	0
Carrying Value | BOA Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	375,000	375,000
Carrying Value | BOA/KeyBank Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	250,000	0
Carrying Value | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of mortgage loans	$ 106,673	$ 107,562

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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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