Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands |
Jun. 29, 2019 |
Mar. 30, 2019 |
Dec. 31, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|---|---|---|---|
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||
| Total Shareholders’ Equity | $ 474,966 | $ 386,625 | $ 351,290 | |||
| Foreign Currency Translation Adjustments | ||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||
| Total Shareholders’ Equity | (6,542) | (7,156) | ||||
| Retirement Liability Adjustment | ||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||
| Retirement Liability Adjustment – Before Tax | (7,442) | (7,814) | ||||
| Tax Benefit of Retirement Liability Adjustment | 1,563 | 1,641 | ||||
| Total Shareholders’ Equity | (5,879) | (6,173) | ||||
| Accumulated Comprehensive Loss | ||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||
| Total Shareholders’ Equity | $ (12,421) | $ (13,449) | $ (13,329) | $ (15,867) | $ (14,277) | $ (13,352) |
| X | ||||||||||
- 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. No definition available.
|
| X | ||||||||||
- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). No definition available.
|
| X | ||||||||||
- Definition Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) attributable to parent. No definition available.
|
| X | ||||||||||
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|