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Debt And Interest Expense (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Debt [Table Text Block] | The following table summarizes information related to our Senior notes:
|  | Issuance Date | Maturity Date | Interest Rate | Principal
|  |  |  |  | As of December 31,
|  |  |  |  | 2020 |  | 2019
|  |  |  |  | (in thousands except interest rates)
Senior notes due 2023 |  | April 16, 2013 | May 1, 2023 | 4.625 | % | $ | 750,000 |  |  | $ | 750,000 |
Senior notes due 2025 |  | March 27, 2015 | April 1, 2025 | 5.250 | % | 500,000 |  |  | 500,000 |
Senior notes due 2027 |  | July 5, 2017 | July 15, 2027 | 4.750 | % | 550,000 |  |  | 550,000 |
Unamortized issuance costs |  |  |  |  | (9,917) |  |  | (12,435) |
Total senior notes |  |  |  |  | $ | 1,790,083 |  |  | $ | 1,787,565 |
Schedule of Components of Interest Expense | The following table presents the components of the Company’s interest expense:
| Year Ended December 31,
2020 |  | 2019 |  | 2018
| (In thousands)
Contractual interest on Senior Notes | $ | 87,063 |  |  | $ | 87,063 |  |  | $ | 87,063 |
Contractual interest on subordinated convertible debentures | — |  |  | — |  |  | 20,015 |
Amortization of debt discount on the subordinated convertible debentures | — |  |  | — |  |  | 4,236 |
Amortization of debt issuance costs and other interest expense | 3,081 |  |  | 3,548 |  |  | 3,531 |
Total interest expense | $ | 90,144 |  |  | $ | 90,611 |  |  | $ | 114,845 |

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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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