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Related-Party Transactions Advisor Fees (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended 23 Months Ended 32 Months Ended
Oct. 03, 2017
Oct. 03, 2017
Sep. 19, 2017
Sep. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Aug. 31, 2017
Aug. 31, 2017
Related Party Transaction [Line Items]                  
Related party transaction, expenses from transactions with related party         $ 5,454 $ 0 $ 0    
Advisory Agreement                  
Related Party Transaction [Line Items]                  
Related party transaction, expenses from transactions with related party         20,301 26,232 11,776    
Accounts payable, related parties           2,022      
Advisory Agreement | Acquisition Fees                  
Related Party Transaction [Line Items]                  
Related party transaction, rate   0.85%             1.00%
Related party transaction, expenses from transactions with related party         1,344 2,342 1,247    
Accounts payable, related parties           0      
Advisory Agreement | Acquisition Expenses                  
Related Party Transaction [Line Items]                  
Related party transaction, expenses from transactions with related party         583 464 208    
Accounts payable, related parties           29      
Advisory Agreement | Asset Management Fees                  
Related Party Transaction [Line Items]                  
Related party transaction, rate 0.85%   0.85% 1.00%       1.00%  
Related party transaction, expenses from transactions with related party         15,573 19,239 4,601    
Accounts payable, related parties           1,687      
Advisory Agreement | OP Unit Distribution                  
Related Party Transaction [Line Items]                  
Related party transaction, expenses from transactions with related party         1,373 1,866 1,820    
Accounts payable, related parties           158      
Advisory Agreement | Class B Unit Distribution                  
Related Party Transaction [Line Items]                  
Related party transaction, expenses from transactions with related party         1,409 1,576 625    
Accounts payable, related parties           148      
Advisory Agreement | Financing Fees                  
Related Party Transaction [Line Items]                  
Related party transaction, rate                 0.75%
Related party transaction, expenses from transactions with related party         0 0 3,228    
Accounts payable, related parties           0      
Advisory Agreement | Disposition Fees                  
Related Party Transaction [Line Items]                  
Related party transaction, rate   1.70%             2.00%
Related party transaction, expenses from transactions with related party         $ 19 745 $ 47    
Accounts payable, related parties           $ 0