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Debt - Unsecured Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Apr. 19, 2018
Feb. 02, 2016
Jun. 24, 2015
Sep. 30, 2019
Jul. 17, 2019
Apr. 17, 2019
Apr. 03, 2019
Dec. 31, 2018
Apr. 20, 2017
Apr. 19, 2017
Jun. 15, 2016
Debt                      
Total principal outstanding       $ 1,387,250       $ 1,136,500      
2020 Senior Unsecured Term Loan | Senior Unsecured Term Loan                      
Debt                      
Total principal outstanding       $ 150,000       $ 150,000      
Effective interest rate       3.12%       3.37%      
2021 Senior Unsecured Term Loan | Senior Unsecured Term Loan                      
Debt                      
Total principal outstanding       $ 100,000       $ 100,000      
Effective interest rate       3.42%       3.90%      
2022 Senior Unsecured Term Loan | Senior Unsecured Term Loan                      
Debt                      
Total principal outstanding       $ 200,000       $ 200,000      
Effective interest rate       3.42%       3.65%      
2023 Senior unsecured notes                      
Debt                      
Unsecured term loan $ 150,000                    
Term of loan facility 5 years                    
2023 Senior unsecured notes | LIBOR | Minimum                      
Debt                      
Interest rate margin (as a percent) 1.40%                    
2023 Senior unsecured notes | LIBOR | Maximum                      
Debt                      
Interest rate margin (as a percent) 2.00%                    
2023 Senior unsecured notes | Base Rate | Minimum                      
Debt                      
Interest rate margin (as a percent) 0.40%                    
2023 Senior unsecured notes | Base Rate | Maximum                      
Debt                      
Interest rate margin (as a percent) 1.00%                    
2023 Senior unsecured notes | Senior Unsecured Term Loan                      
Debt                      
Total principal outstanding       $ 150,000              
Effective interest rate       3.77%       4.01%      
Amount of debt not hedged       $ 75,000              
2023 Senior unsecured notes | Senior Unsecured Notes                      
Debt                      
Total principal outstanding       $ 150,000       $ 150,000      
Effective interest rate       4.19%       4.19%      
2024 Senior unsecured notes                      
Debt                      
Effective interest rate       3.91%       3.91%      
2024 Senior unsecured notes | Senior Unsecured Notes                      
Debt                      
Total principal outstanding       $ 175,000       $ 175,000      
2026 Senior unsecured notes                      
Debt                      
Effective interest rate           4.52%          
2026 Senior unsecured notes | Senior Unsecured Term Loan                      
Debt                      
Unsecured term loan           $ 200,000          
2026 Senior unsecured notes | Senior Unsecured Notes                      
Debt                      
Total principal outstanding       $ 200,000              
Effective interest rate       4.52%              
2029 Senior unsecured notes | Senior Unsecured Term Loan                      
Debt                      
Unsecured term loan         $ 75,000            
2029 Senior unsecured notes | Senior Unsecured Notes                      
Debt                      
Total principal outstanding       $ 200,000              
Effective interest rate       4.31%              
Operating partnership | LIBOR                      
Debt                      
Interest rate margin (as a percent)       1.45%              
Operating partnership | 2020 Senior Unsecured Term Loan                      
Debt                      
Amount of debt not hedged       $ 75,000              
Operating partnership | 2020 Senior Unsecured Term Loan | LIBOR                      
Debt                      
Interest rate margin (as a percent)       1.40%              
Operating partnership | 2020 Senior Unsecured Term Loan | LIBOR | Minimum                      
Debt                      
Interest rate margin (as a percent)       1.40%              
Operating partnership | 2020 Senior Unsecured Term Loan | LIBOR | Maximum                      
Debt                      
Interest rate margin (as a percent)       2.00%              
Operating partnership | 2020 Senior Unsecured Term Loan | Base Rate | Minimum                      
Debt                      
Interest rate margin (as a percent)       0.40%              
Operating partnership | 2020 Senior Unsecured Term Loan | Base Rate | Maximum                      
Debt                      
Interest rate margin (as a percent)       1.00%              
Operating partnership | 2020 Senior Unsecured Term Loan | Senior Unsecured Term Loan                      
Debt                      
Unsecured term loan $ 150,000   $ 150,000                
Term of loan facility     5 years                
Operating partnership | 2021 Senior Unsecured Term Loan | LIBOR                      
Debt                      
Interest rate margin (as a percent)       1.40%              
Operating partnership | 2021 Senior Unsecured Term Loan | LIBOR | Minimum                      
Debt                      
Interest rate margin (as a percent)       1.40%              
Operating partnership | 2021 Senior Unsecured Term Loan | LIBOR | Maximum                      
Debt                      
Interest rate margin (as a percent)       2.00%              
Operating partnership | 2021 Senior Unsecured Term Loan | Base Rate | Minimum                      
Debt                      
Interest rate margin (as a percent)       0.40%              
Operating partnership | 2021 Senior Unsecured Term Loan | Base Rate | Maximum                      
Debt                      
Interest rate margin (as a percent)       1.00%              
Operating partnership | 2021 Senior Unsecured Term Loan | Senior Unsecured Term Loan                      
Debt                      
Unsecured term loan   $ 100,000                  
Term of loan facility   5 years                  
Operating partnership | 2022 Senior Unsecured Term Loan | LIBOR                      
Debt                      
Interest rate margin (as a percent)       1.40%              
Operating partnership | 2022 Senior Unsecured Term Loan | LIBOR | Minimum                      
Debt                      
Interest rate margin (as a percent)       1.40%              
Operating partnership | 2022 Senior Unsecured Term Loan | LIBOR | Maximum                      
Debt                      
Interest rate margin (as a percent)       2.00%              
Operating partnership | 2022 Senior Unsecured Term Loan | Base Rate | Minimum                      
Debt                      
Interest rate margin (as a percent)       0.40%              
Operating partnership | 2022 Senior Unsecured Term Loan | Base Rate | Maximum                      
Debt                      
Interest rate margin (as a percent)       1.00%              
Operating partnership | 2022 Senior Unsecured Term Loan | Senior Unsecured Term Loan                      
Debt                      
Unsecured term loan                   $ 100,000  
Increase in accordion feature borrowing capacity                   300,000  
Aggregate principal amount                   $ 200,000  
Operating partnership | 2023 Senior unsecured notes | LIBOR                      
Debt                      
Interest rate margin (as a percent)       1.40%              
Operating partnership | 2023 Senior unsecured notes | Senior Unsecured Notes | Private Placement                      
Debt                      
Aggregate principal amount                     $ 150,000
Stated interest rate                     4.19%
Percentage of term notes that may be prepaid                     100.00%
Percentage of term notes that holders have right to purchase in cash                     100.00%
Percentage of term notes that holders may redeem for cash                     100.00%
Operating partnership | 2024 Senior unsecured notes | Senior Unsecured Term Loan                      
Debt                      
Unsecured term loan                 $ 175,000    
Stated interest rate                 3.91%    
Percentage of term notes that may be prepaid                 100.00%    
Percentage of term notes that holders have right to purchase in cash                 100.00%    
Percentage of term notes that holders may redeem for cash                 100.00%    
Operating partnership | 2026 Senior unsecured notes | Senior Unsecured Term Loan                      
Debt                      
Stated interest rate           4.11%          
Operating partnership | 2026 Senior unsecured notes | Senior Unsecured Notes                      
Debt                      
Effective interest rate             4.52%        
Percentage of term notes that may be prepaid           100.00%          
Percentage of term notes that holders have right to purchase in cash           100.00%          
Percentage of term notes that holders may redeem for cash           100.00%          
Operating partnership | 2029 Senior unsecured notes | Senior Unsecured Term Loan                      
Debt                      
Aggregate principal amount           $ 125,000          
Operating partnership | 2029 Senior unsecured notes | Senior Unsecured Term Loan | Private Placement                      
Debt                      
Unsecured term loan           $ 200,000          
Stated interest rate           4.31%          
Operating partnership | 2029 Senior unsecured notes | Senior Unsecured Notes                      
Debt                      
Percentage of term notes that may be prepaid           100.00%          
Percentage of term notes that holders have right to purchase in cash           100.00%          
Percentage of term notes that holders may redeem for cash           100.00%