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Non-controlling interests - Summary of Non-Controlling Interests in Subsidiaries (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of subsidiaries [line items] |  |
Current assets | $ 435,860 | $ 514,698
Current liabilities | (221,723) | (141,702)
Carrying amount of NCI | 59,304 | 63,414
Net increase (decrease) in cash and cash equivalents | (108,503) | (193,189)
Revenue | 617,823 | 459,016
Net loss and comprehensive loss | 73,685 | (379,631)
Net loss allocated to NCI | $ (6,901) | $ (17,747)
Hellas |  |
Disclosure of subsidiaries [line items] |  |
NCI percentage | 5.00% | 5.00%
Current assets | $ 67,902 | $ 78,308
Non-current assets | 1,858,544 | 1,846,952
Current liabilities | (1,050,952) | (191,936)
Non-current liabilities | (405,318) | (1,181,693)
Net assets | 470,176 | 551,631
Carrying amount of NCI | 13,362 | 17,619
Cash flows (used in) generated from operating activities | (215) | (66,135)
Cash flows used in investing activities | (45,216) | (80,306)
Cash flows generated from (used in) financing activities | 50,026 | 133,520
Net increase (decrease) in cash and cash equivalents | 4,595 | (12,921)
Revenue | 140,156 | 110,488
Net loss and comprehensive loss | (107,758) | (298,272)
Net loss allocated to NCI | (5,388) | (14,913)
Dividends paid to NCI | $ 0 | $ 0
Deva |  |
Disclosure of subsidiaries [line items] |  |
NCI percentage | 19.50% | 19.50%
Current assets | $ 1,867 | $ 2,177
Non-current assets | 415,149 | 414,330
Current liabilities | (312) | (536)
Non-current liabilities | (294,493) | (289,134)
Net assets | 122,211 | 126,837
Carrying amount of NCI | 42,903 | 44,169
Cash flows (used in) generated from operating activities | (4,856) | (16,695)
Cash flows used in investing activities | (15) | (419)
Cash flows generated from (used in) financing activities | 4,803 | 15,218
Net increase (decrease) in cash and cash equivalents | (68) | (1,896)
Revenue | 0 | 0
Net loss and comprehensive loss | (6,494) | (14,100)
Net loss allocated to NCI | (1,266) | (2,750)
Dividends paid to NCI | $ 0 | $ 0

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