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UNSECURED SENIOR NOTES (Tables) | 6 Months Ended
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Jun. 30, 2021
Senior Notes |
Summary of debt | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, | ​ | December 31, |  | Effective | ​ | Issuance | ​ | Maturity |
Unsecured Senior Notes |  | 2021 |  | 2020 |  | Interest Rate | ​ | Date | ​ | Date |
​ | ​ | (in thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
$300M 4.375% Guaranteed Notes due 2023 (1) | ​ | $ | 300,000 | ​ | $ | 300,000 |  | 4.33 | % | ​ | Various (1) | ​ | Dec-23 | ​
$300M 4.000% Guaranteed Notes due 2025 (2) | ​ |  | 300,000 | ​ |  | 300,000 |  | 3.99 | % | ​ | Various (2) | ​ | Nov-25 | ​
$300M 3.125% Guaranteed Notes due 2026 | ​ | ​ | 300,000 | ​ | ​ | 300,000 | ​ | 3.18 | % | ​ | Aug-16 | ​ | Sep-26 | ​
$350M 4.375% Guaranteed Notes due 2029 | ​ | ​ | 350,000 | ​ | ​ | 350,000 | ​ | 4.46 | % | ​ | Jan-19 | ​ | Feb-29 | ​
$350M 3.000% Guaranteed Notes due 2030 | ​ | ​ | 350,000 | ​ | ​ | 350,000 | ​ | 3.04 | % | ​ | Oct-19 | ​ | Feb-30 | ​
$450M 2.000% Guaranteed Notes due 2031 | ​ | ​ | 450,000 | ​ | ​ | 450,000 | ​ | 2.10 | % | ​ | Oct-20 | ​ | Feb-31 | ​
Principal balance outstanding | ​ | ​ | 2,050,000 | ​ | ​ | 2,050,000 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: Discount on issuance of unsecured senior notes, net | ​ | ​ | (7,086) | ​ | ​ | (7,470) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: Loan procurement costs, net | ​ | ​ | (11,288) | ​ | ​ | (12,158) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total unsecured senior notes, net | ​ | $ | 2,031,626 | ​ | $ | 2,030,372 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
| (1) | On April 4, 2017, the Operating Partnership issued $50.0 million of its 4.375% senior notes due 2023, which are part of the same series as the $250.0 million principal amount of the Operating Partnership’s 4.375% senior notes due December 15, 2023 issued on December 17, 2013. The $50.0 million and $250.0 million tranches were priced at 105.040% and 98.995%, respectively, of the principal amount to yield 3.495% and 4.501%, respectively, to maturity. The combined weighted average effective interest rate of the 2023 notes is 4.330%.
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| (2) | On April 4, 2017, the Operating Partnership issued $50.0 million of its 4.000% senior notes due 2025, which are part of the same series as the $250.0 million principal amount of the Operating Partnership’s 4.000% senior notes due November 15, 2025 issued on October 26, 2015. The $50.0 million and $250.0 million tranches were
|  | priced at 101.343% and 99.735%, respectively, of the principal amount to yield 3.811% and 4.032%, respectively, to maturity. The combined weighted average effective interest rate of the 2025 notes is 3.994%.
​

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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