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Long-term debt - Schedule (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 1,458,286 | $ 1,502,271
Less current maturities | (383,793) | (55,905)
Non-current portion of long-term debt | 1,074,493 | 1,446,366
Debt discounts and deferred financing fees | 17,600 | 17,800
Unsecured notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | 1,189,976 | 1,188,163
3.25% due December 15, 2019 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 349,026 | 348,060
3.25% due December 15, 2019 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 3.25% |
5.25% due March 1, 2022 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 248,480 | 248,072
5.25% due March 1, 2022 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.25% |
4.25% due December 1, 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 297,232 | 296,873
4.25% due December 1, 2024 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 4.25% |
5.65% due December 1, 2044 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 295,238 | 295,158
5.65% due December 1, 2044 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.65% |
Egypt limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 101,226 | 241,190
Egypt limited recourse debt facilities | LIBOR | Bottom of range |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 0.90% |
Egypt limited recourse debt facilities | LIBOR | Top of range |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 1.60% |
Other limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 167,084 | 72,918
LIBOR Plus 0.75% to LIBOR Plus 2.5% due 2019 to 2021 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 5,483 | 72,918
LIBOR Plus 0.75% to LIBOR Plus 2.5% due 2019 to 2021 | LIBOR | Bottom of range |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 0.75% |
LIBOR Plus 0.75% to LIBOR Plus 2.5% due 2019 to 2021 | LIBOR | Top of range |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 2.50% |
5.58% due June 30, 2031 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 77,709 | 0
5.58% due June 30, 2031 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.58% |
5.35% due September 30, 2033 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 83,892 | $ 0
5.35% due September 30, 2033 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.35% |

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