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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