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Investments in real estate - Real estate asset sales (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
ft²
Dec. 31, 2021
USD ($)
ft²
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Real Estate Properties [Line Items]              
Impairment of real estate         $ 52,675,000 $ 48,078,000 $ 12,334,000
Long-term Debt $ 8,791,866,000 $ 8,791,866,000     8,791,866,000    
Equity Method Investee              
Real Estate Properties [Line Items]              
Long-term Debt $ 636,728,000 $ 636,728,000     $ 636,728,000    
2301 5th Avenue              
Real Estate Properties [Line Items]              
Area of Real Estate Property | ft² 197,135 197,135     197,135    
Proceeds from Sale of Real Estate $ 118,700,000            
Proceeds from Sale of Real Estate (Per RSF) 602            
Gain (Loss) on Sale of Properties $ 23,200,000            
Menlo Gateway | Equity Method Investee              
Real Estate Properties [Line Items]              
Area of Real Estate Property | ft² 772,983 772,983     772,983    
Proceeds from Sale of Real Estate   $ 397,900,000          
Gain (Loss) on Sale of Properties         $ 101,100,000    
Equity interest percentage (in percent) 49.00% 49.00%     49.00%    
Contractual Sales Price of Real Estate   $ 541,500,000          
Long-term Debt $ 143,600,000 $ 143,600,000     $ 143,600,000    
San Francisco Bay Area              
Real Estate Properties [Line Items]              
Impairment of real estate     $ 22,500,000        
Other markets              
Real Estate Properties [Line Items]              
Impairment of real estate     18,600,000        
San Francisco Bay Area and Seattle              
Real Estate Properties [Line Items]              
Proceeds from Sale of Real Estate     73,100,000        
Gain (Loss) on Sale of Properties     $ (435,000)        
Impairment of real estate       $ 6,900,000