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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plan Assets |  |  |  |
Defined benefit plan, plan assets, contributions by employer |  | $ 2,000 |  |
Net actuarial loss |  | 49,300 | $ 56,500 |
Expense provision for 401 (k) plans |  | 4,100 | 4,400 | $ 4,300
Company contributions |  | 32,300 | 41,200 | $ 44,800
Hedge fund investments |  |  |  |
Pension Plan Assets |  |  |  |
Investments in hedge funds which do not have readily determinable fair values |  | 11,600 | 12,800 |
Employee Pension Plans |  |  |  |
Pension Plan Assets |  |  |  |
Defined benefit plan, plan assets, contributions by employer |  | $ 242 | $ 1,235 |
Discount rate (as a percent) |  | 5.20% | 2.70% |
Expected return on assets (as a percent) |  | 5.75% | 5.75% | 5.75%
Employee Pension Plans | Forecast |  |  |  |
Pension Plan Assets |  |  |  |
Expected return on assets (as a percent) | 6.30% |  |  |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation 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)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + 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 https://asc.fasb.org/extlink&oid=123447040&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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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