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Subsequent events (Details) $ / shares in Units, $ in Thousands					3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 10, 2020 $ / shares	Aug. 13, 2020 $ / shares	Apr. 10, 2020 $ / shares	Mar. 03, 2020 $ / shares	Mar. 31, 2020 USD ($)	Dec. 10, 2020 installment	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($)
Subsequent Event [Line Items]
Dividends to be paid (in dollars per share)							$ 0.11	$ 0.10
Net short-term borrowings | $							$ 13,159	$ 0	$ 0
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)				$ 0.11
Net short-term borrowings | $					$ 136,000
Scenario, Forecast
Subsequent Event [Line Items]
Common stock, dividends, number of payment installments | installment						3
Dividends to be paid (in dollars per share)	$ 0.03	$ 0.03	$ 0.05

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- Definition

Common Stock, Dividends, Number of Payment Installments

+ References

No definition available.

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X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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