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Retirement Plans, Defined Contribution Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Contribution Plan [Member] |  |  |
Defined Contribution Pension and Other Postretirement Benefit Expense [Abstract] |  |  |
Percentage of matching contributions under defined contribution plan | 4.00% |  |
Total expense for defined contribution plans | $ 6,100 | $ 6,000 | $ 6,000
Pension Plan [Member] |  |  |
Benefit obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 39,421 | 34,152 |
Service cost | 1,601 | 1,432 | 1,465
Interest cost | 1,022 | 1,273 | 1,137
Foreign currency exchange rate changes | 690 | 558 |
Benefits paid | (1,948) | (1,899) |
Amendments | 42 | 0 |
Actuarial loss | 4,803 | 3,905 |
Benefit obligation at end of year | 45,631 | 39,421 | 34,152
Change in fair value of plan assets [Roll Forward] |  |  |
Plan assets at beginning of year | 31,776 | 28,299 |
Company contributions | 1,117 | 1,086 |
Foreign currency exchange rate changes | 882 | 968 |
Benefits paid | (1,948) | (1,899) |
Actual gain on plan assets | 3,849 | 3,322 |
Plan assets at end of year | 35,676 | 31,776 | 28,299
Funded status | (9,955) | (7,645) |
Accumulated benefit obligation | 44,559 | 38,596 |
Amounts recognized in Consolidated Balance Sheets [Abstract] |  |  |
Accrued employee and retiree benefits | (19,349) | (17,143) |
Other accrued expenses | (722) | (710) |
Other assets | 10,116 | 10,208 |
Net liability | (9,955) | (7,645) |
Components of annual benefit cost [Abstract] |  |  |
Service cost | 1,601 | 1,432 | 1,465
Interest cost | 1,022 | 1,273 | 1,137
Expected return on plan assets | (813) | (896) | (896)
Recognized actuarial loss (gain) | 41 | (176) | (141)
Settlement income | 0 | 0 | (179)
Defined benefit expense | $ 1,851 | $ 1,633 | $ 1,386
Weighted average liability assumptions [Abstract] |  |  |
Discount rate | 1.87% | 2.69% |
Expected return on plan assets | 2.17% | 2.68% |
Rate of compensation increase | 0.34% | 0.34% |
Weighted average cost assumption [Abstract] |  |  |
Discount rate | 2.69% | 3.80% | 3.16%
Expected return on plan assets | 2.68% | 3.21% | 3.03%
Rate of compensation increase | 0.34% | 0.31% | 0.33%
Estimated Future Benefit Payments [Abstract] |  |  |
2021 | $ 1,600 |  |
2022 | 3,900 |  |
2023 | 1,600 |  |
2024 | 4,000 |  |
2025 | 1,700 |  |
2026 through 2030 | 11,700 |  |
Estimated future employer contributions for next fiscal year | 1,200 |  |
Amounts recognized in Accumulated Other Comprehensive Loss [Abstract] |  |  |
Unrecognized net actuarial loss | 2,402 | $ 683 |
Prior service cost | 187 | 146 |
Total before tax effects | 2,589 | 829 |
Other Comprehensive Income (Loss), Pension Adjustment, Net of Tax [Abstract] |  |  |
Net actuarial (loss) gain arising during the period | (1,293) | (1,091) | $ 1,257
Prior service cost | (32) | 0 | (127)
Amortization of actuarial loss (gain), included in defined benefit expense | 32 | (130) | (103)
Pension adjustment, net of tax | $ (1,293) | $ (1,221) | $ 1,027

X
- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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