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Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Summary of Senior Notes | The following table summarizes our senior notes as of June 30, 2018 and December 31, 2017 (in thousands):
|  | June 30, 2018 |  |  | December 31, 2017 |
4.250% senior notes, due 2024 (1) |  | $ | 500,000 |  |  | $ | 500,000 |
3.50% senior notes, due 2020 (2) |  |  | 300,000 |  |  |  | 300,000 |
5.20% senior notes, due 2047 (3) |  |  | 225,000 |  |  |  | 225,000 |
|  |  | 1,025,000 |  |  |  | 1,025,000 |
Debt issuance costs, net |  |  | (9,545 | ) |  |  | (10,060 | )
|  | $ | 1,015,455 |  |  | $ | 1,014,940 |
(1) | In July 2014, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 4.250% senior notes due July 2024. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption. In July 2016, we issued an additional $200.0 million in aggregate principal amount of 4.25% senior notes due 2024.
(2) | In December 2015, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 3.50% senior notes due December 2020. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption.
(3) | In October 2017, we completed the pricing of a registered underwritten public offering of $200.0 million in aggregate principal amount of 5.20% senior notes due October 2047. Interest on the senior notes is payable quarterly in arrears on January 15, April 15, July 15, and October 15. On or after October 15, 2022, we may redeem some or all of the senior notes at any time at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued interest thereon to the redemption date. On October 27, 2017, we completed the sale of an additional $25.0 million aggregate principal amount of Notes pursuant to the over-allotment option.
Schedule of Corporate Date Maturity | Our senior notes mature as follows, based upon contractual terms (in thousands):
2018 |  | $ | — |
2019 |  |  | — |
2020 |  |  | 300,000 |
2021 |  |  | — |
2022 |  |  | — |
Thereafter |  |  | 725,000 |
|  | $ | 1,025,000 |

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