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Employee benefit plans - Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligations and Related Expenses (Details) - Pension Benefits	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure
Discount rate, Obligation	4.00%	4.00%	4.00%
Discount rate, Expense	4.00%	4.00%	5.00%
Expected long-term return on plan assets	7.50%	7.50%	7.50%

X

- Definition

Defined Benefit Plan Assumptions Used Calculating Benefit Obligations Cost Expected Long Term Return On Assets

+ References

No definition available.

+ Details

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X

- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

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

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- Definition

The interest rate used to adjust for the time value of money.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

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.

+ References

No definition available.

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