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Capital structure - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Capital structure
Issuance of common stock related to equity offering (in shares)	4,600,000
Net proceeds from public offering	$ 0	$ 117,916	$ 0	$ 0
Share Price	$ 27.04
Common stock, authorized shares (in shares)		125,000,000	125,000,000
Common stock
Capital structure
Common stock, authorized shares (in shares)		125,000,000
Over-Allotment Option
Capital structure
Issuance of common stock related to equity offering (in shares)	600,000

X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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-Paragraph 1
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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

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- Definition

Number of new stock issued during the period.

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