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Employee benefit plans (Tables) | 6 Months Ended
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Jun. 30, 2017
Retirement Benefits [Abstract] |
Schedule of net benefit costs | Components of net periodic benefit cost (credit) for the Company's pension and other postretirement benefit plans were as follows:
| Pension Benefits | Other Postretirement Benefits
Three Months Ended June 30, | 2017 |  | 2016 |  | 2017 |  | 2016 |
| (In thousands)
Components of net periodic benefit cost (credit): |  |  |  |
Service cost | $ | — |  | $ | — |  | $ | 306 |  | $ | 374 |
Interest cost | 4,089 |  | 4,220 |  | 825 |  | 895 |
Expected return on assets | (5,234 | ) | (5,182 | ) | (1,175 | ) | (1,118 | )
Amortization of prior service credit | — |  | — |  | (343 | ) | (343 | )
Amortization of net actuarial loss | 1,385 |  | 1,514 |  | 100 |  | 299 |
Net periodic benefit cost (credit), including amount capitalized | 240 |  | 552 |  | (287 | ) | 107 |
Less amount capitalized | 73 |  | 121 |  | (114 | ) | 4 |
Net periodic benefit cost (credit) | $ | 167 |  | $ | 431 |  | $ | (173 | ) | $ | 103 |
| Pension Benefits | Other Postretirement Benefits
Six Months Ended June 30, | 2017 |  | 2016 |  | 2017 |  | 2016 |
| (In thousands)
Components of net periodic benefit cost (credit): |  |  |  |
Service cost | $ | — |  | $ | — |  | $ | 753 |  | $ | 824 |
Interest cost | 8,103 |  | 8,610 |  | 1,633 |  | 1,844 |
Expected return on assets | (10,263 | ) | (10,462 | ) | (2,320 | ) | (2,267 | )
Amortization of prior service credit | — |  | — |  | (686 | ) | (686 | )
Amortization of net actuarial loss | 3,178 |  | 3,107 |  | 436 |  | 747 |
Net periodic benefit cost (credit), including amount capitalized | 1,018 |  | 1,255 |  | (184 | ) | 462 |
Less amount capitalized | 180 |  | 202 |  | (153 | ) | 38 |
Net periodic benefit cost (credit) | $ | 838 |  | $ | 1,053 |  | $ | (31 | ) | $ | 424 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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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