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Employee Benefit Plans (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 17, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure |  |  |  |  |  |
Annual returns on planned assets (as percentage) |  | 25.80% | (6.20%) | 17.40% | 8.20% | (0.40%)
Defined benefit obligation expenses in next year |  | $ 1,800,000 | $ 1,300,000 |  |  |
Supplemental Executive Retirement Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Accrued liability |  | 640,000 |  |  |  |
Accrued expense |  | $ 320,000 | $ 320,000 |  |  |
Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Percentage of employer match |  | 3.00% |  |  |  |
Defined benefit plan contributions by employer percent |  | 6.00% |  |  |  |
Contribution to defined benefit plan | $ 1,600,000 |  |  |  |  |

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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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