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Employee Benefit Plans (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 10, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure |  |  |  |  |  |
Percentage of employer match |  | 3.00% |  |  |  |
Defined benefit plan contributions by employer percent |  | 6.00% |  |  |  |
Annual returns on planned assets (as percentage) |  | (6.20%) | 17.40% | 8.20% | (0.40%) | 8.30%
Contribution to defined benefit plan | $ 1,800,000 |  |  |  |  |
Defined benefit plan, minimum required contribution |  | $ 0 |  |  |  |
Defined benefit obligation expenses in next year |  | 1,500,000 | $ 1,700,000 |  |  |
Supplemental Executive Retirement Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Accrued liability |  | 320,000 |  |  |  |
Accrued expense |  | $ 320,000 |  |  |  |

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363 + Details
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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=108410482&loc=d3e1928-114920 + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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