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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt |
Long-term debt |
|  | As of December 31, |
|  | 2017 |  | 2016 |
|  | (In thousands) |
6.15% senior notes due February 2018 (1) |  | $ | 460,762 |  | $ | 827,539 |
9.25% senior notes due January 2019 |  |  | 303,489 |  |  | 303,489 |
5.00% senior notes due September 2020 |  |  | 669,846 |  |  | 669,540 |
4.625% senior notes due September 2021 |  |  | 695,108 |  |  | 694,868 |
5.50% senior notes due January 2023 |  |  | 600,000 |  |  | 600,000 |
5.10% senior notes due September 2023 |  |  | 346,576 |  |  | 346,448 |
0.75% senior exchangeable notes due January 2024 |  |  | 429,982 |  |  | — |
Term loan facility |  |  | — |  |  | 162,500 |
Revolving credit facility |  |  | 510,000 |  |  | — |
Commercial paper |  |  | 40,000 |  |  | — |
Other |  |  | 181 |  |  | 297 |
|  |  | 4,055,944 |  |  | 3,604,681 |
Less: current portion |  |  | 181 |  |  | 297 |
Less: deferred financing costs |  |  | 27,997 |  |  | 26,049 |
|  | $ | 4,027,766 |  | $ | 3,578,335 |
| (1) |  | The 6.15% senior notes due February 2018 have been classified as long-term because we have the ability and intent to repay this obligation utilizing our revolving credit facility. We used the proceeds from our January 2018 senior notes offering to repay these notes
Maturity of primary debt | As of December 31, 2017, the principal amount and maturities of our primary debt for each of the five years after 2017 and thereafter are as follows:
|  | Paid at Maturity |
|  | (In thousands) |
2018 |  | $ | 460,837 | (1)
2019 |  |  | 303,489 | (2)
2020 |  |  | 1,220,675 | (3)
2021 |  |  | 696,000 | (4)
2022 |  |  | — |
Thereafter |  |  | 1,522,300 | (5)
|  | $ | 4,203,301 |
| (1) |  | Represents our 6.15% senior notes due February 2018.
| (2) |  | Represents our 9.25% senior notes due January 2019.
| (3) |  | Represents our 5.0% senior notes due September 2020 and amounts outstanding under our commercial paper program and revolving credit facility due July 2020.
| (4) |  | Represents our 4.625% senior notes due September 2021.
| (5) |  | Represents our 5.50% senior notes due January 2023, 5.10% senior notes due September 2023 and 0.75% senior exchangeable notes due January 2024.
Short-Term Borrowings |
|  | December 31, |
|  | 2017 |
|  | (In thousands) |
Credit available |  | $ | 759,421 |
Less: Letters of credit outstanding, inclusive of financial and performance guarantees |  |  | 153,489 |
Remaining availability |  | $ | 605,932 |

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