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Investments in real estate - Real estate asset sales (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Real Estate          
(Loss) gain on sales of real estate $ (435) $ 1,586   $ 2,344 $ 1,586
Impairment of real estate 42,620 $ 7,680   $ 52,675 $ 22,901
San Francisco Bay Area          
Real Estate          
Impairment of real estate 22,500        
San Francisco Bay Area and Seattle          
Real Estate          
Impairment of real estate     $ 6,900    
Other markets          
Real Estate          
Impairment of real estate $ 18,600