Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Narrative (Details)

v3.21.2
Segment Information - Narrative (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2021
unit
segment
Dec. 31, 2020
segment
Jun. 30, 2021
property
Segment Reporting [Abstract]      
Number of reportable segments | segment 1 2  
Office      
Segment Reporting Information [Line Items]      
Number of properties held for sale 12   12
Number of properties     1
Retail      
Segment Reporting Information [Line Items]      
Number of properties that do not meet criteria for reportable segment     8
Number of properties held for sale     8