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Debt (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Schedule of Senior Notes | Our senior notes are summarized as follows ($000’s omitted):
| September 30, 2018 |  | December 31, 2017
4.250% unsecured senior notes due March 2021 (a) | $ | 700,000 |  |  | $ | 700,000 |
5.500% unsecured senior notes due March 2026 (a) | 700,000 |  |  | 700,000 |
5.000% unsecured senior notes due January 2027 (a) | 600,000 |  |  | 600,000 |
7.875% unsecured senior notes due June 2032 (a) | 300,000 |  |  | 300,000 |
6.375% unsecured senior notes due May 2033 (a) | 400,000 |  |  | 400,000 |
6.000% unsecured senior notes due February 2035 (a) | 300,000 |  |  | 300,000 |
Net premiums, discounts, and issuance costs (b) | (13,200 | ) |  | (13,057 | )
Total senior notes | 2,986,800 |  |  | 2,986,943 |
Other notes payable | 18,618 |  |  | 20,024 |
Notes payable | $ | 3,005,418 |  |  | $ | 3,006,967 |
Estimated fair value | $ | 2,959,080 |  |  | $ | 3,263,774 |
(a) | Redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries.
(b) | The carrying value of senior notes reflects the impact of premiums, discounts, and issuance costs that are amortized to interest cost over the respective terms of the senior notes.

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