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Restructuring and Asset Impairment - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 30, 2017 | Apr. 01, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 638 |  | $ 1,077 |
Severance and retention costs liability | 7,053 | $ 6,856 | 6,531 | $ 8,102
Accrued Compensation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and retention costs liability | 3,100 |  | 2,600 |
RMS |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 1,038 | 18,100 |  |
RMS | Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs | 5,500 |  |  |
RMS | Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs | 6,000 |  |  |
Cash portion of expected amount (up to) | 8,000 |  |  |
Asset Impairments and Accelerated Depreciation | RMS |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | $ 17,700 |  |
Severance and Transition Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 616 |  | 1,017 |
Severance and Transition Costs | Other Noncurrent Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and retention costs liability | 3,900 |  | $ 4,000 |
Severance and Transition Costs | RMS |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 523 |  |  |
Expected restructuring costs | $ 5,000 |  |  |

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