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Real Estate, Operating Real Estate, Real Estate Under Construction, and Equity Investment in Real Estate - Narratives (Details)
$ in Thousands
3 Months Ended
Mar. 08, 2018
USD ($)
Feb. 19, 2016
USD ($)
Mar. 31, 2018
USD ($)
property
$ / €
Mar. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2017
USD ($)
$ / €
Acquisition            
Effect of exchange rate fluctuation     $ 11,577 $ 4,155    
Capitalized funds     30,371      
Deferred tax liability     62,595     $ 63,980
Non-recourse mortgages, net     1,215,653     1,129,432
Construction loan     19,400      
Capitalized interest     1,115      
Placed into service     $ 25,937      
Number of properties | property     59      
Equity investment in real estate     $ 20,179     20,919
Noncash investing            
Acquisition            
Accrued liabilities     1,900      
Initial Funding            
Acquisition            
Capitalized funds     11,000      
Real Estate            
Acquisition            
Effect of exchange rate fluctuation     26,200      
Depreciation expense     7,900 6,300    
Real Estate | Student Housing in Barcelona, Spain            
Acquisition            
Investment purchase price $ 10,500          
Ownership Interest In joint venture (percentage) 99.00%          
Real Estate | Student Housing in Barcelona, Spain | Forecasted            
Acquisition            
Anticipated investment cost         $ 28,500  
Operating Real Estate            
Acquisition            
Depreciation expense     $ 4,400 $ 4,400    
Build To Suit Projects            
Acquisition            
Number of BTS projects | property     6      
Unfunded commitment     $ 178,400      
Build To Suit Projects | Equity method investments            
Acquisition            
Unfunded commitment     21,900      
Build To Suit Projects | University in Accra, Ghana            
Acquisition            
Capitalized funds     32,500      
Accrued liabilities     900      
Deferred tax liability     3,700      
Non-recourse mortgages, net   $ 41,000        
Contractual obligation     65,700      
Build To Suit Projects | University in Accra, Ghana | US Treasury            
Acquisition            
Variable interest rate on debt   3.00%        
Equity method investments            
Acquisition            
Equity investment in real estate     20,200     20,900
Equity method investment, liabilities     $ 22,300     $ 21,500
Equity method investments | Self Storage            
Acquisition            
Number of properties | property     4      
Equity method investments ownership percentage     90.00%      
Equity method investment counterparty ownership percentage     10.00%      
Euro            
Real Estate Properties            
Increase decrease in foreign currency exchange rate     2.70%      
Foreign currency exchange rate | $ / €     1.2321     1.1993