Derivative Instruments - Interest Rate Hedges in the Condensed Consolidated Balance Sheets (Details) - Cash Flow Hedging - Designated as hedging instrument - Interest Rate Swap - USD ($) $ in Thousands |
Sep. 28, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Other current assets | ||
| Derivative [Line Items] | ||
| Interest rate swap designated as cash flow hedge, assets | $ 154 | |
| Other non-current assets | ||
| Derivative [Line Items] | ||
| Interest rate swap designated as cash flow hedge, assets | $ 956 | $ 60 |
| Other accrued liabilities | ||
| Derivative [Line Items] | ||
| Interest rate swap designated as cash flow hedge, liability | $ 127 |