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Employee Benefit Plans - Defined Benefit Plans Located within Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 403,500 | $ 351,800
Benefit obligation | 558,400 | 509,400
Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 378,900 | 331,400
Benefit obligation | 470,100 | 439,400
Pension Plan | Other assets, net |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 58,410 | 25,469
Pension Plan | Other current liabilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Benefit obligation | 19,432 | 12,144
Pension Plan | Other liabilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Benefit obligation | $ 135,440 | $ 145,432

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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