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Employee Benefit Plans (Plan Assets at Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Equity partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | Fair Value Measured at Net Asset Value Per Share | Fair Value Measured at Net Asset Value Per Share |
Hedge fund investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | Fair Value Measured at Net Asset Value Per Share | Fair Value Measured at Net Asset Value Per Share |
Employee Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | $ 73,375 | $ 71,940 | $ 73,357
Employee Pension Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 57,499 | 58,253 |
Employee Pension Plans | Level 1 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 57,499 | 58,253 |
Employee Pension Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 3,057 | 3,086 |
Employee Pension Plans | Level 2 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 3,057 | 3,086 |
Employee Pension Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Level 3 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Fair Value, Inputs, Level 1, 2 and 3 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 60,556 | 61,339 |
Employee Pension Plans | Fair Value Measured at Net Asset Value Per Share | Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 12,819 | 10,601 |
Employee Pension Plans | Cash and cash equivalents | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 2,533 | 1,582 |
Employee Pension Plans | Cash and cash equivalents | Level 1 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 2,533 | 1,582 |
Employee Pension Plans | Cash and cash equivalents | Level 2 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Cash and cash equivalents | Level 3 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Fixed income funds | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 3,057 | 5,086 |
Employee Pension Plans | Fixed income funds | Level 1 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 2,000 |
Employee Pension Plans | Fixed income funds | Level 2 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 3,057 | 3,086 |
Employee Pension Plans | Fixed income funds | Level 3 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Mutual funds | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 54,966 | 54,671 |
Employee Pension Plans | Mutual funds | Level 1 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 54,966 | 54,671 |
Employee Pension Plans | Mutual funds | Level 2 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Mutual funds | Level 3 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Equity partnerships | Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 4,259 | 3,700 |
Employee Pension Plans | Hedge fund investments | Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | $ 8,560 | $ 6,901 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -URI http://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 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: 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=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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