Other operating expenses (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Details of other operating expenses [Abstract]
Leases and fees	$ (743)	$ (1,726)
Operation and maintenance	(32,444)	(25,897)
Independent professional services	(7,091)	(2,230)
Supplies	(7,391)	(7,176)
Insurance	(6,443)	(5,928)
Levies and duties	(9,909)	(9,688)
Other expenses	(2,173)	(1,770)
Total	$ (66,194)	$ (54,415)

No definition available.

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- Definition

The amount of expense relating to general and administrative activities of the entity.

+ References

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- Definition

The amount of expense arising from purchased insurance.

+ References

+ Details

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- Definition

The amount of payments on leases and subleases recognised as an expense by the lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of miscellaneous other operating expenses. [Refer: Other operating income (expense)]

+ References

+ Details

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- Definition

The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

+ References

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- Definition

The amount of fees paid or payable for professional services.

+ References

+ Details

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- Definition

The amount of expenses incurred for the day-to-day servicing of assets, which may include the cost of labour, consumables or small parts.

+ References

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- Definition

The amount of tax expense exclusive of income tax expense.

+ References

+ Details

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