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Employee Benefit Plans - Investments Held in Rabbi Trusts (Details) - Rabbi Trusts - Level 1 - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plan Disclosure [Line Items] |  |
Total Investments held in Rabbi Trusts | $ 70,953 | $ 59,403
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Investments held in Rabbi Trusts | 18,460 | 15,578
Fixed income mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Investments held in Rabbi Trusts | 9,800 | 7,849
United States | Equity mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Investments held in Rabbi Trusts | 34,035 | 29,298
Foreign Plan | Equity mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Investments held in Rabbi Trusts | $ 8,658 | $ 6,678

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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