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Debt Financing (Narratives) (Details)
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Nov. 15, 2019
USD ($)
Sep. 13, 2019
USD ($)
Extension_Option
Dec. 31, 2018
USD ($)
Extension_Option
Dec. 31, 2019
USD ($)
Mar. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Extension_Option
Nov. 30, 2017
USD ($)
Oct. 02, 2017
USD ($)
Debt Instrument [Line Items]                  
Notes payable including related party, gross     $ 545,824,000 $ 865,657,000   $ 865,657,000 $ 545,824,000    
Debt, weighted average years to maturity           2 years 7 months 6 days 2 years 10 months 24 days    
Debt, weighted average interest rate     2.85% 2.54%   2.54% 2.85%    
Note payable to affiliate     $ 55,000,000 $ 75,000,000   $ 75,000,000 $ 55,000,000    
Subsequent Event | Notes Payable, Maturing November 2020                  
Debt Instrument [Line Items]                  
Outstanding notes payable         $ 152,000,000.0        
Restated Hines Credit Facility | Hines and Affiliates                  
Debt Instrument [Line Items]                  
Notes payable, advance, extension term     6 months            
Note payable to affiliate               $ 75,000,000.0 $ 240,000,000.0
Notes payable, advance, term to maturity     6 months            
Notes payable, advance, number of extension options | Extension_Option     1       1    
Credit Facility | Hines and Affiliates                  
Debt Instrument [Line Items]                  
Secured credit facility, maximum commitment       75,000,000   75,000,000      
Note payable to affiliate     $ 55,000,000 75,000,000   75,000,000 $ 55,000,000    
Proceeds from Lines of Credit           134,000,000.0      
Repayments of Lines of Credit           114,000,000.0      
Credit Facility | Hines and Affiliates | Subsequent Event                  
Debt Instrument [Line Items]                  
Note payable to affiliate         11,000,000.0        
Proceeds from Lines of Credit         0        
Repayments of Lines of Credit         64,000,000.0        
Revolving Credit Facility | Line of Credit                  
Debt Instrument [Line Items]                  
Secured credit facility, maximum commitment   $ 425,000,000.0   275,000,000   275,000,000      
Foreign currency commitment amount   $ 137,500,000              
Number of extension options | Extension_Option   2              
Notes payable, advance, extension term   1 year              
Long-term line of credit       104,000,000.0   $ 104,000,000.0      
Proceeds from Lines of Credit $ 104,000,000.0     $ 0          
Revolving Credit Facility | Line of Credit | Subsequent Event                  
Debt Instrument [Line Items]                  
Long-term line of credit         163,000,000.0        
Proceeds from Lines of Credit         59,000,000.0        
Repayments of Lines of Credit         $ 0        
Revolving Credit Facility | Line of Credit | Fed Funds Effective Rate Overnight Index Swap Rate                  
Debt Instrument [Line Items]                  
Basic spread on variable rate debt   0.50%              
Revolving Credit Facility | Line of Credit | Adjusted LIBO Rate                  
Debt Instrument [Line Items]                  
Basic spread on variable rate debt   1.00%              
Revolving Credit Facility | Line of Credit | Adjusted LIBO Rate | Minimum                  
Debt Instrument [Line Items]                  
Interest rate during period   1.35%              
Revolving Credit Facility | Line of Credit | Adjusted LIBO Rate | Maximum                  
Debt Instrument [Line Items]                  
Interest rate during period   2.05%              
Revolving Credit Facility | Line of Credit | Base Rate | Minimum                  
Debt Instrument [Line Items]                  
Interest rate during period   0.35%              
Revolving Credit Facility | Line of Credit | Base Rate | Maximum                  
Debt Instrument [Line Items]                  
Interest rate during period   1.05%