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CAPITAL AND FINANCIAL RISK MANAGEMENT - Credit Risk and Capital Risk Management (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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CAPITAL AND FINANCIAL RISK MANAGEMENT |  |  |
Cash and cash equivalents | $ 632,978 | $ 539,974 | $ 124,150
Short- term investments | 10,919 | 8,424 |
Long-term debt | 1,371,851 | 1,072,790 |
Total equity | 4,946,991 | 4,492,474 | $ 4,141,020
Credit Risk |  |  |
CAPITAL AND FINANCIAL RISK MANAGEMENT |  |  |
Cash and cash equivalents | 632,978 | 539,974 |
Short- term investments | 10,919 | 8,424 |
Restricted cash | 1,223 | 1,162 |
Trade receivables | 12,000 | 8,185 |
Derivative financial instrument assets | 17,240 | 364 |
Total | 674,360 | 558,109 |
Capital Risk |  |  |
CAPITAL AND FINANCIAL RISK MANAGEMENT |  |  |
Long-term debt | 1,371,851 | 1,202,686 |
Total equity | 4,946,991 | 4,492,474 |
Total | $ 6,318,842 | $ 5,695,160 |

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