Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

v3.20.1
Subsequent Events (Details)
3 Months Ended
Apr. 24, 2020
USD ($)
ft²
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Subsequent Event [Line Items]        
Proceeds from the sale of property   $ 6,939,000 $ 330,369,000  
Loan balance   2,877,121,000   $ 2,808,517,000
111 River St. [Member] | Subsequent Event [Member] | Disposal Group, Not Discontinued Operations [Member]        
Subsequent Event [Line Items]        
Area Of Real Estate Property | ft² 566,215      
Proceeds from the sale of property $ 244,500,000      
Loan balance $ 150,000,000      
Secured Debt [Member]        
Subsequent Event [Line Items]        
Loan balance   $ 2,045,152,000   $ 1,925,038,000