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Summary of significant accounting policies - Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal statutory rate				35.00%	35.00%	35.00%
Increase in income tax expense due to Tax Cuts and Jobs Act	$ 2.6
Increase in income tax expense due to Tax Cuts and Jobs Act (in dollars per share)	$ 0.35
Reclassification from AOCI to retained earning due to the Tax Cuts And Jobs Act Of 2017			$ 1.1
Forecast
Federal statutory rate		21.00%

X

- Definition

Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017.

+ References

No definition available.

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- Definition

Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 per share.

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- Definition

The reclassification from AOCI to retained earning due to the Tax Cuts And Jobs Act Of 2017.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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