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Real Estate Transactions - Life Science JV Interest Purchase (Details)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
property
Nov. 30, 2018
USD ($)
property
joint_venture
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Real Estate [Line Items]        
Payments to acquire real estate       $ 21,000
Gain (loss) on consolidation   $ 50,000 $ 11,501 $ (41,017)
Life science joint ventures        
Real Estate [Line Items]        
Number of joint ventures (in joint ventures) | joint_venture   3    
Number of properties acquired (in properties) | property 2 4    
Payments to acquire real estate $ 245,000 $ 92,000    
Investment ownership percentage   100.00%