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Capital disclosures (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of liquidity and capitalization [Line Items] |  |  |
Cash and cash equivalents | $ 256,077,000 | $ 375,479,000 | $ 223,890,000
Undrawn credit facilities | 300,000,000 | 300,000,000 |
Total liquidity | 556,077,000 | 675,479,000 |
Total debt | 1,458,286,000 | 1,502,271,000 |
Non-controlling interests | 296,628,000 | 244,347,000 |
Shareholders’ equity | 1,511,213,000 | 1,500,764,000 |
Total capitalization | $ 3,266,127,000 | $ 3,247,382,000 |
Total debt to capitalization (as a percent) | 45.00% | 46.00% |
Net debt to capitalization (as a percent) | 40.00% | 39.00% |
Unsecured notes |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Total debt | $ 1,189,976,000 | $ 1,188,163,000 |
Egypt limited recourse debt facilities |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Total debt | 101,226,000 | 241,190,000 |
Other limited recourse debt facilities |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Total debt | 167,084,000 | $ 72,918,000 |
Revolving credit facility |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Notional amount | $ 300,000,000 |  |

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