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Other operating income and expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other operating income [Abstract]      
Grants $ 59,707 $ 59,085 $ 67,859
Income from various services and insurance proceeds 21,137 6,453 998
Total 80,844 65,538 68,857
Other operating expenses [Abstract]      
Leases and fees (6,641) (5,309) (3,865)
Operation and maintenance (129,873) (133,292) (116,405)
Independent professional services (36,178) (30,515) (19,046)
Supplies (20,350) (17,177) (18,001)
Insurance (24,289) (23,390) (20,277)
Levies and duties (52,409) (44,440) (32,352)
Other expenses (14,721) (6,195) (14,882)
Total $ (284,461) $ (260,318) $ (224,828)