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Equity - Share-based compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation	$ 2,902	$ 3,125
Share-based compensation	3,282	2,745
Option Expense
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation	1,676	1,245
DSU Expense for 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation	307	679
Share-based compensation		(380)
DSU Expense Adjustment for 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation	(45)	0
Share-based compensation	380
RSU Expense
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation	$ 964	$ 1,201

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of expense from share-based payment transactions with employees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The increase (decrease) in equity resulting from share-based payment transactions. [Refer: Equity]

+ References

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