Annual report pursuant to Section 13 and 15(d)

Noncontrolling Interests (Narrative) (Details)

v3.20.4
Noncontrolling Interests (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Noncontrolling Interests [Line Items]        
Common units in operating partnership 7,305,355      
Noncontrolling interests $ 218,963 $ 216,135    
Number of shares of common stock for each unit of limited partnership interest redeemed 1      
Net income allocation to noncontrolling interests - common units $ 33,141 28,962 $ 46,229  
PS [Member]        
Noncontrolling Interests [Line Items]        
Noncontrolling interests 215,700 213,200    
JV Partner [Member]        
Noncontrolling Interests [Line Items]        
Noncontrolling interests $ 3,300 $ 2,900    
Brentford at The Mile [Member] | Investment in Joint Venture [Member]        
Noncontrolling Interests [Line Items]        
Consolidated entity ownership percentage 98.20%      
Brentford at The Mile [Member] | JV Partner [Member]        
Noncontrolling Interests [Line Items]        
Noncontrolling interests $ 500      
Consolidated entity ownership percentage 1.80%      
Highgate at the Mile [Member] | Investment in Joint Venture [Member]        
Noncontrolling Interests [Line Items]        
Consolidated entity ownership percentage 95.00%      
Highgate at the Mile [Member] | JV Partner [Member]        
Noncontrolling Interests [Line Items]        
Noncontrolling interests       $ 4,000
Consolidated entity ownership percentage 5.00%     5.00%