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Pension and other postretirement benefits (Tables) | 3 Months Ended
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Mar. 31, 2013
Net Benefit Cost of Pension and Postretirement Benefit Plans | Net benefit cost of pension and postretirement benefit plans consisted of the following:
|  | Pension Three Months Ended |  |  | Other Postretirement Benefits Three Months Ended |
|  | March 31, 2013 |  |  | April 1, 2012 |  |  | March 31, 2013 |  |  | April 1, 2012 |
|  | (Dollars in thousands) |
Service cost |  | $ | 465 |  |  | $ | 678 |  |  | $ | 164 |  |  | $ | 158 |
Interest cost |  |  | 4,139 |  |  |  | 4,126 |  |  |  | 999 |  |  |  | 473 |
Expected return on plan assets |  |  | (5,770 | ) |  |  | (5,043 | ) |  |  | — |  |  |  | — |
Net amortization and deferral |  |  | 1,410 |  |  |  | 1,606 |  |  |  | 730 |  |  |  | 123 |
Net benefit cost |  | $ | 244 |  |  | $ | 1,367 |  |  | $ | 1,893 |  |  | $ | 754 |

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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=21915506&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration