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New accounting standards ASU 2017-07 (Details 2) - USD ($) | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net unrealized gains (losses) on investments used to satisfy obligations under nonqualified benefit plans | $ (500,000) | $ 2,900,000
Adjustments for New Accounting Pronouncement |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Defined benefit plan, net periodic benefit cost (credit) |  | 1,800,000
Net unrealized gains (losses) on investments used to satisfy obligations under nonqualified benefit plans |  | $ 3,100,000

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- Definition Amount of net periodic benefit cost (credit) for defined benefit 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 (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition The change in cash surrender or contract value during the period which adjusted the amount of premiums paid in determining the expense or income recognized under the contract for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6384439&loc=d3e42048-111605 + Details
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