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Retirement Plans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to defined benefit plan | $ 165 |  |
Pension plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service period | 5 years |  |
Assumptions used in determining periodic pension cost: |  |  |
Discount rate | 4.20% | 4.20% |
Expected long-term rate of return on plan assets | 7.30% | 7.50% |
Pension plan | Equities |  |  |
Current investment policy targets: |  |  |
Current investment mix | 64.00% |  | 64.00%
Pension plan | Treasury/Corporate Notes |  |  |
Current investment policy targets: |  |  |
Current investment mix | 35.00% |  | 35.00%
Pension plan | Money market funds |  |  |
Current investment policy targets: |  |  |
Current investment mix | 1.00% |  | 1.00%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + 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 contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current 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 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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