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Fair Value Measurements - Narratives (Details) - USD ($) $ in Thousands | Mar. 27, 2020 | Dec. 31, 2019 | Sep. 27, 2019 | Dec. 31, 2015
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other Long-term Debt | $ 16,391 | $ 17,224 |  |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Convertible Debt, Fair Value Disclosures | 114,600 | 131,900 |  |
Other Long-term Debt | 16,400 | 17,200 |  |
Fair Value, Nonrecurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | 0 |  |  |
Total liabilities measured and recorded at fair value | 0 |  |  |
TVN [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Postemployment Benefits Liability | $ 300 | 800 |  |
Convertible Note due 2020 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |  | 4.00%
Convertible Note due 2020 | Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Convertible Debt, Fair Value Disclosures | $ 53,800 | $ 66,800 |  |
Convertible Note due 2024 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.00% |  | 2.00% |

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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