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Capital disclosures (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of liquidity and capitalization [Line Items] |  |  |
Cash and cash equivalents | $ 375,479,000 | $ 223,890,000 | $ 254,934,000
Undrawn credit facilities | 300,000,000 | 300,000,000 |
Total liquidity | 675,479,000 | 523,890,000 |
Total debt | 1,502,271,000 | 1,556,206,000 |
Non-controlling interests | 244,347,000 | 208,515,000 |
Shareholders’ equity | 1,500,764,000 | 1,596,835,000 |
Total capitalization | $ 3,247,382,000 | $ 3,361,556,000 |
Total debt to capitalization (as a percent) | 46.00% | 46.00% |
Net debt to capitalization (as a percent) | 39.00% | 42.00% |
Unsecured notes |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Total debt | $ 1,188,163,000 | $ 1,186,424,000 |
Limited recourse debt facilities, including current portion |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Total debt | 314,108,000 | $ 369,782,000 |
Revolving credit facility |  |  |
Disclosure of liquidity and capitalization [Line Items] |  |  |
Notional amount | $ 300,000,000 |  |
Facilities term | 5 years |  |

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