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Capital disclosures (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of liquidity and capitalization [Line Items] |  |  |
Cash and cash equivalents | $ 416,763,000 | $ 256,077,000 | $ 375,479,000
Total liquidity | 1,516,763,000 | 556,077,000 |
Total debt | 1,768,853,000 | 1,458,286,000 |
Non-controlling interests | 298,675,000 | 296,628,000 |
Shareholders’ equity | 1,331,685,000 | 1,511,213,000 |
Total capitalization | $ 3,399,213,000 | $ 3,266,127,000 |
Total debt to capitalization | 52.00% | 45.00% |
Net debt to capitalization | 45.00% | 40.00% |
Revolving credit facility |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Undrawn credit facilities | $ 300,000,000 | $ 300,000,000 |
Construction facilities |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Undrawn credit facilities | 800,000,000 | 0 |
Unsecured notes |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Total debt | 1,535,662,000 | 1,189,976,000 |
Egypt limited recourse debt facilities |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Total debt | $ 75,165,000 | $ 101,226,000 |
Ownership of subsidiary, percentage of inclusion | 100.00% | 100.00% |
Other limited recourse debt facilities |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Total debt | $ 158,026,000 | $ 167,084,000 |

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