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Debt And Interest Expense (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Debt [Table Text Block] | The following table summarizes information related to our Senior notes (in thousands, except interest rates):
|  |  |  |  | As of December 31,
|  |  |  |  | 2018 |  | 2017
|  | Issuance Date | Maturity Date | Interest Rate | Principal
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 |  |  |  |  | (14,953 | ) |  | (17,471 | )
Total senior notes |  |  |  |  | $ | 1,785,047 |  |  | $ | 1,782,529 |
Carrying amounts of liability and equity components [Table Text Block] | The table below presents the carrying amounts of the liability and equity components as of December 31, 2017.
Debt discount upon issuance (net of issuance costs of $14,449) | $ | 686,221 |
Deferred taxes associated with the debt discount upon issuance | (267,225 | )
Carrying amount of equity component | $ | 418,996 |
Principal amount of Subordinated Convertible Debentures | $ | 1,250,000 |
Unamortized discount of liability component | (612,303 | )
Unamortized debt issuance costs associated with the liability component | (10,081 | )
Carrying amount of liability component | $ | 627,616 |
Schedule of Components of Interest Expense | The following table presents the components of the Company’s interest expense:
| Year Ended December 31,
2018 |  | 2017 |  | 2016
| (In thousands)
Contractual interest on Subordinated Convertible Debentures | $ | 20,015 |  |  | $ | 47,432 |  |  | $ | 40,625 |
Contractual interest on Senior Notes | 87,063 |  |  | 73,638 |  |  | 60,938 |
Amortization of debt discount on the Subordinated Convertible Debentures | 4,236 |  |  | 12,012 |  |  | 11,094 |
Amortization of debt issuance costs and other interest expense | 3,531 |  |  | 3,254 |  |  | 2,907 |
Total interest expense | $ | 114,845 |  |  | $ | 136,336 |  |  | $ | 115,564 |

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