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Credit Facilities - Credit Facility (Details)
€ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 01, 2019
USD ($)
Apr. 12, 2019
leased_office_and_industrial_property
Jul. 02, 2018
EUR (€)
Jul. 02, 2018
USD ($)
Jul. 24, 2017
USD ($)
extension
Apr. 30, 2019
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Aug. 01, 2019
EUR (€)
Aug. 01, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]                              
Revolving credit facility                     $ 101,405,000       $ 363,894,000
Repayments on revolving credit facilities               $ 499,649,000 $ 87,375,000            
Maximum distribution as percentage of FFO           95.00%                  
Maximum distribution as percentage of FFO, under exception           100.00%                  
Maximum distribution as percentage of AFFO           105.00%                  
Credit Facility                              
Line of Credit Facility [Line Items]                              
Weighted-average effective interest rate                   2.20% 2.20%        
Increase in outstanding balance $ 39,400,000                            
Credit Facility | Federal Funds                              
Line of Credit Facility [Line Items]                              
Basis spread on base rate determination         0.50%                    
Credit Facility | LIBOR                              
Line of Credit Facility [Line Items]                              
Basis spread on base rate determination         1.00%                    
Credit Facility | LIBOR | Minimum                              
Line of Credit Facility [Line Items]                              
Interest rate spread         1.60%                    
Credit Facility | LIBOR | Maximum                              
Line of Credit Facility [Line Items]                              
Interest rate spread         2.20%                    
Credit Facility | Base Rate | Minimum                              
Line of Credit Facility [Line Items]                              
Interest rate spread         0.60%                    
Credit Facility | Base Rate | Maximum                              
Line of Credit Facility [Line Items]                              
Interest rate spread         1.20%                    
Credit Facility | Revolving Credit Facility                              
Line of Credit Facility [Line Items]                              
Revolving credit facility                     $ 101,400,000   $ 170,700,000 $ 259,500,000  
Available for future borrowings                     101,200,000        
Repayments on revolving credit facilities             $ 70,000,000.0                
Credit Facility | Term Loan                              
Line of Credit Facility [Line Items]                              
Revolving credit facility                     389,900,000 € 359.6 400,000,000.0 $ 277,400,000  
Credit Facility | KeyBank National Association | Unsecured debt                              
Line of Credit Facility [Line Items]                              
Maximum borrowing capacity       $ 950,000,000.0 $ 725,000,000.0                    
Increase in aggregate commitments         $ 35,600,000               515,000,000.0    
Total line of credit commitment                         1,750,000,000    
Number of extensions | extension         1                    
Extension term         1 year                    
Credit Facility | KeyBank National Association | Unsecured debt | Minimum                              
Line of Credit Facility [Line Items]                              
Maximum borrowing capacity         $ 722,200,000                    
Credit Facility | KeyBank National Association | Unsecured debt | Maximum                              
Line of Credit Facility [Line Items]                              
Maximum borrowing capacity       914,400,000                      
Credit Facility | KeyBank National Association | Unsecured debt | Revolving Credit Facility                              
Line of Credit Facility [Line Items]                              
Maximum borrowing capacity                     835,000,000.0   835,000,000.0    
Increase in maximum borrowing capacity       132,000,000.0                      
Facility fee multiplier         0.0030                    
Revolving credit facility                     101,405,000       $ 363,894,000
Credit Facility | KeyBank National Association | Unsecured debt | Revolving Credit Facility | Above Threshold                              
Line of Credit Facility [Line Items]                              
Unused capacity commitment fee         0.25%                    
Commitment fee percentage         50.00%                    
Credit Facility | KeyBank National Association | Unsecured debt | Revolving Credit Facility | Below Threshold                              
Line of Credit Facility [Line Items]                              
Unused capacity commitment fee         0.15%                    
Commitment fee percentage         50.00%                    
Credit Facility | KeyBank National Association | Unsecured debt | Term Loan Facility                              
Line of Credit Facility [Line Items]                              
Maximum borrowing capacity                   € 359.6 $ 392,500,000        
Increase in maximum borrowing capacity     € 51.8 $ 60,200,000                      
Credit Facility Amendment                              
Line of Credit Facility [Line Items]                              
Maximum borrowing capacity                         $ 1,235,000,000    
Credit Facility Amendment | Revolving Credit Facility | LIBOR | Minimum                              
Line of Credit Facility [Line Items]                              
Interest rate spread 1.45%                            
Credit Facility Amendment | Revolving Credit Facility | LIBOR | Maximum                              
Line of Credit Facility [Line Items]                              
Interest rate spread 2.05%                            
Credit Facility Amendment | Revolving Credit Facility | Base Rate | Minimum                              
Line of Credit Facility [Line Items]                              
Interest rate spread 0.45%                            
Credit Facility Amendment | Revolving Credit Facility | Base Rate | Maximum                              
Line of Credit Facility [Line Items]                              
Interest rate spread 1.05%                            
Credit Facility Amendment | Term Loan | LIBOR | Minimum                              
Line of Credit Facility [Line Items]                              
Interest rate spread 1.40%                            
Credit Facility Amendment | Term Loan | LIBOR | Maximum                              
Line of Credit Facility [Line Items]                              
Interest rate spread 2.00%                            
Credit Facility Amendment | Term Loan | Base Rate | Minimum                              
Line of Credit Facility [Line Items]                              
Interest rate spread 0.40%                            
Credit Facility Amendment | Term Loan | Base Rate | Maximum                              
Line of Credit Facility [Line Items]                              
Interest rate spread 1.00%                            
Multi-Tenant Mortgage Loan IV | Column Financial, Inc. and Societe Generale Financial Corporation                              
Line of Credit Facility [Line Items]                              
Collateral, number of leased offices and industrial properties | leased_office_and_industrial_property   16                          
Number of states in which mortgaged properties are located (state) | leased_office_and_industrial_property   12