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Real Estate Transactions - Life Science JV Interest Purchase (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Nov. 30, 2018
USD ($)
property
joint_venture
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
property
Mar. 31, 2018
USD ($)
Real Estate [Line Items]        
Payments to acquire real estate       $ 21,000
Gain (loss) on consolidation $ 50,000 $ 0   $ (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 4   2  
Payments to acquire real estate $ 92,000   $ 245,000  
Investment ownership percentage 100.00%