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Pension and other postretirement benefits | 3 Months Ended
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Mar. 29, 2015
Compensation and Retirement Disclosure [Abstract] |
Pension and other postretirement benefits | Pension and other postretirement benefits The Company has a number of defined benefit pension and postretirement plans covering eligible U.S. and non-U.S. employees. The defined benefit pension plans are noncontributory. The benefits under these plans are based primarily on years of service and employees’ pay near retirement. The Company’s funding policy for U.S. plans is to contribute annually, at a minimum, amounts required by applicable laws and regulations. Obligations under non-U.S. plans are systematically provided for by depositing funds with trustees or by book reserves. As of March 29, 2015, the Company’s U.S. defined benefit pension plans and the Company’s other postretirement benefit plans, other than certain postretirement benefit plans covering employees subject to a collective bargaining agreement, are frozen. The Company and certain of its subsidiaries provide medical, dental and life insurance benefits to pensioners and survivors. The associated plans are unfunded and approved claims are paid from Company funds. Net benefit cost of pension and postretirement benefit plans consisted of the following:
| Pension Three Months Ended |  | Other Postretirement Benefits Three Months Ended
| March 29, 2015 |  | March 30, 2014 |  | March 29, 2015 |  | March 30, 2014
| (Dollars in thousands)
Service cost | $ | 471 |  |  | $ | 450 |  |  | $ | 107 |  |  | $ | 138 |
Interest cost | 4,486 |  |  | 4,483 |  |  | 512 |  |  | 597 |
Expected return on plan assets | (6,425 | ) |  | (6,260 | ) |  | — |  |  | — |
Net amortization and deferral | 1,530 |  |  | 1,071 |  |  | 77 |  |  | 26 |
Net benefit expense (income) | $ | 62 |  |  | $ | (256 | ) |  | $ | 696 |  |  | $ | 761 |
The Company’s pension contributions are expected to be approximately $2.9 million during 2015, of which $1.2 million were made during the three months ended March 29, 2015.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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