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Employee benefit plans - Schedule of Pension Plan Weighted-Average Asset Allocations (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure
Weighted-average asset allocations	100.00%	100.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure
Weighted-average asset allocations	4.20%	5.90%
Equity Securities
Defined Benefit Plan Disclosure
Weighted-average asset allocations	58.00%	57.00%
Corporate Debt Securities
Defined Benefit Plan Disclosure
Weighted-average asset allocations	26.20%	23.00%
U.S. Government Agencies
Defined Benefit Plan Disclosure
Weighted-average asset allocations	11.60%	14.10%

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

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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