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Long-term debt - Schedule (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 1,768,853 | $ 1,458,286
Less current maturities | (38,420) | (383,793)
Non-current portion of long-term debt | 1,730,433 | 1,074,493
Debt discounts and deferred financing fees | 20,400 | 17,600
Unsecured notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | 1,535,662 | 1,189,976
3.25% due December 15, 2019 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 0 | 349,026
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 | $ 248,912 | 248,480
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 | $ 297,607 | 297,232
4.25% due December 1, 2024 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 4.25% |
5.25% due December 15, 2029 |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.25% |
Total long-term debt | $ 693,822 | 0
5.25% due December 15, 2029 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.25% |
5.65% due December 1, 2044 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 295,321 | 295,238
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 | $ 75,165 | 101,226
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 | $ 158,026 | 167,084
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 | $ 1,526 | 5,483
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 | $ 73,700 | 77,709
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 | $ 82,800 | $ 83,892
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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