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Employee Benefit Plans - Schedule of defined benefit plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined benefit plans |  |  |
Change in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | $ 603,309 | $ 637,165 |
Interest cost | 17,332 | 16,465 | $ 19,799
Benefits paid | (33,521) | (31,616) |
Actuarial (gains)/losses | (137,098) | (18,705) |
Projected benefit obligation at end of year | 450,022 | 603,309 | 637,165
Plan assets: |  |  |
Fair value at beginning of year | 517,148 | 492,827 |
Actual return on plan assets | (124,901) | 31,848 |
Company contributions | 24,999 | 24,089 |
Benefits paid | (33,521) | (31,616) |
Fair value at end of year | 383,725 | 517,148 | 492,827
Funded status | (66,297) | (86,161) |
Amounts recognized in Consolidated Balance Sheets: |  |  |
Current liabilities | 0 | 0 |
Noncurrent liabilities | (66,297) | (86,161) |
Total | (66,297) | (86,161) |
Amounts Recognized in Accumulated Other Comprehensive Loss: |  |  |
Net actuarial loss recognized in accumulated other comprehensive loss | 98,884 | 90,197 |
Prior service cost recognized in accumulated other comprehensive loss | 352 | 370 |
SERPs |  |  |
Change in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 18,023 | 18,890 |
Interest cost | 509 | 473 |
Benefits paid | (1,541) | (1,028) |
Actuarial (gains)/losses | (3,598) | (312) |
Projected benefit obligation at end of year | 13,393 | 18,023 | 18,890
Plan assets: |  |  |
Fair value at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Company contributions | 1,541 | 1,028 |
Benefits paid | (1,541) | (1,028) |
Fair value at end of year | 0 | 0 | $ 0
Funded status | (13,393) | (18,023) |
Amounts recognized in Consolidated Balance Sheets: |  |  |
Current liabilities | (1,411) | (1,353) |
Noncurrent liabilities | (11,982) | (16,670) |
Total | (13,393) | (18,023) |
Amounts Recognized in Accumulated Other Comprehensive Loss: |  |  |
Net actuarial loss recognized in accumulated other comprehensive loss | 3,467 | 7,364 |
Prior service cost recognized in accumulated other comprehensive loss | $ 0 | $ 0 |

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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 https://asc.fasb.org/extlink&oid=123447040&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 https://asc.fasb.org/extlink&oid=126968391&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 https://asc.fasb.org/extlink&oid=123447040&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 https://asc.fasb.org/extlink&oid=126968391&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 https://asc.fasb.org/extlink&oid=123447040&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 https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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