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Employee Benefit Plans - Plan assets using fair value hierarchy (Details) - Retirement Income Plan - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Investments measured at Net Asset Value | $ 2,821 | $ 3,600
Investments at Fair Value | 40,142 | 38,364
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy | 505 | 1,140
Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy | 36,813 | 11,163
Domestic Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy | 3 | 15,182
International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy |  | 7,279
Investment |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy | 37,321 | 34,764
Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy | 505 | 1,140
Level 1 | Domestic Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy | 3 | 5,602
Level 1 | Investment |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy | 508 | 6,742
Level 2 | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy | 36,813 | 11,163
Level 2 | Domestic Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy |  | 9,581
Level 2 | International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy |  | 7,279
Level 2 | Investment |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Assets in the Fair Value Hierarchy | $ 36,813 | $ 28,023

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of investment within defined benefit plan asset category. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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