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Employee Retirement Plans (Tables) | 9 Months Ended
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Sep. 26, 2020
Employee Retirement Plans [Abstract] |
Schedule of Costs of Retirement Plans [Table Text Block] | The following table summarizes the company's net periodic pension benefit related to the AGA Group pension plans (in thousands):
|  | Three Months Ended |  | Nine Months Ended
|  | Sep 26, 2020 |  | Sep 28, 2019 |  | Sep 26, 2020 |  | Sep 28, 2019
Net Periodic Pension Benefit: |  |  |  |  |  |  |  |
Service cost |  | $ | 649 |  |  | $ | 593 |  |  | $ | 1,918 |  |  | $ | 1,839 |
Interest cost |  | 6,456 |  |  | 7,995 |  |  | 19,086 |  |  | 24,776 |
Expected return on assets |  | (18,089) |  |  | (16,118) |  |  | (53,476) |  |  | (49,948) |
Amortization of net loss (gain) |  | 842 |  |  | 149 |  |  | 2,489 |  |  | 462 |
Amortization of prior service cost (credit) |  | 642 |  |  | 614 |  |  | 1,897 |  |  | 1,904 |
Curtailment loss (gain) |  | — |  |  | 185 |  |  | — |  |  | 573 |
|  | $ | (9,500) |  |  | $ | (6,582) |  |  | $ | (28,086) |  |  | $ | (20,394) |

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- Definition Employee Retirement Plans [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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