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Debt (Tables) | 6 Months Ended
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Jun. 30, 2016
Debt Disclosure [Abstract] |
Schedule of Senior Notes | Our senior notes are summarized as follows ($000’s omitted):
| June 30, 2016 |  | December 31, 2015
6.500% unsecured senior notes due May 2016 (a) | — |  |  | 465,245 |
7.625% unsecured senior notes due October 2017 (b) | 123,000 |  |  | 123,000 |
4.250% unsecured senior notes due March 2021 (a) | 300,000 |  |  | — |
5.500% unsecured senior notes due March 2026 (a) | 700,000 |  |  | — |
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 (c) | (19,179 | ) |  | (12,163 | )
Total senior notes | $ | 2,103,821 |  |  | $ | 1,576,082 |
Estimated fair value | $ | 2,204,630 |  |  | $ | 1,643,651 |
(a) | Redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries.
(b) | Not redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries.
(c) | 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. As discussed in Note 1, we adopted ASU 2015-03 in January 2016. We applied the new guidance retrospectively to all prior periods presented in the financial statements to conform to the 2016 presentation. As a result, $10.3 million of debt issuance costs at December 31, 2015, were reclassified from other assets to a reduction in senior notes.

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