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Real estate asset sales (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
ft²
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
ft²
Jun. 30, 2018
USD ($)
Real Estate          
Contributions from noncontrolling interests $ 487,000   $ 7,235,000 $ 440,277,000 $ 13,814,000
75/125 Binney Street          
Real Estate          
Noncontrolling Interest Share (in percentage) 60.00%     60.00%  
Area of Real Estate Property | ft² 388,270     388,270  
Proceeds from sale of real estate   $ 438,000,000      
Proceeds from Sale of Real Estate (Per RSF)   $ 1,880      
Additional Paid-In Capital          
Real Estate          
Contributions from noncontrolling interests     $ 257,000 $ 202,246,000 $ 257,000