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Other operating income and expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Other operating income [Abstract]    
Grants $ 14,789 $ 14,857
Income from various services and insurance proceeds 11,650 13,557
Total 26,439 28,414
Other operating expenses [Abstract]    
Leases and fees (731) (743)
Operation and maintenance (33,817) (32,444)
Independent professional services (8,833) (7,091)
Supplies (6,865) (7,391)
Insurance (6,112) (6,443)
Levies and duties (3,069) (9,909)
Other expenses (1,146) (2,173)
Total $ (60,573) $ (66,194)