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Fair Value of Financial Instruments - Summary of Assets Associated with Pension Plan (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | $ 13,667 | $ 13,068
Level 1 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 2,979 | 2,900
Level 2 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 10,689 | 10,168
Level 3 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 0 | 0
Mutual Funds |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 2,715 | 2,539
Mutual Funds | Level 1 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 2,715 | 2,539
Mutual Funds | Level 2 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 0 | 0
Mutual Funds | Level 3 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 0 | 0
Fixed Income |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 10,689 | 10,168
Fixed Income | Level 1 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 0 | 0
Fixed Income | Level 2 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 10,689 | 10,168
Fixed Income | Level 3 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 0 | 0
Cash and Cash Equivalents |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 264 | 361
Cash and Cash Equivalents | Level 1 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 264 | 361
Cash and Cash Equivalents | Level 2 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | 0 | 0
Cash and Cash Equivalents | Level 3 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + 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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