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Fair value measurement (Details Textual) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement [Line Items]
Assets	$ 4,217,221,000	$ 4,332,813,000	$ 4,266,415,000
Investment property [member]
Disclosure of fair value measurement [Line Items]
Assets	$ 544,000	$ 191,000

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- References

No definition available.

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- Definition

The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity.

+ References

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