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Pension and other post-retirement benefits - Fair Value of Investments by Asset Category (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	100.00%
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 454,641
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	75.00%
Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 338,946
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	25.00%
Debt securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 115,695
Other
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	0.00%
Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0

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- Definition

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+ References

No definition available.

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ 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)
-URI http://asc.fasb.org/extlink&oid=82843861&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)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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