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Long-term debt - Schedule (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 1,502,271 | $ 1,556,206
Less current maturities | (55,905) | (53,997)
Non-current portion of long-term debt | 1,446,366 | 1,502,209
Debt discounts and deferred financing fees | 17,800 | 17,800
Unsecured notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | 1,188,163 | 1,186,424
3.25% due December 15, 2019 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 348,060 | 347,126
3.25% due December 15, 2019 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Unsecured notes, interest rate | 3.25% |
5.25% due March 1, 2022 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 248,072 | 247,685
5.25% due March 1, 2022 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Unsecured notes, interest rate | 5.25% |
4.25% due December 1, 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 296,873 | 296,529
4.25% due December 1, 2024 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Unsecured notes, interest rate | 4.25% |
5.65% due December 1, 2044 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 295,158 | 295,084
5.65% due December 1, 2044 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Unsecured notes, interest rate | 5.65% |
Egypt limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 241,190 | 288,515
Other limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 72,918 | $ 81,267

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