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Fair Value Measurements - Narratives (Details) - USD ($) $ in Thousands | Sep. 25, 2020 | Jun. 26, 2020 | Dec. 31, 2019 | Sep. 27, 2019 | Dec. 31, 2015
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Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Long-term Debt | $ 21,100 |  | $ 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 |  |  |  |
Convertible Note due 2022 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.375% | 4.375% |  |  |
Convertible Note due 2022 | Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible Debt, Fair Value Disclosures | $ 42,900 |  |  |  |
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 | $ 8,700 |  | 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% |
Convertible Note due 2024 | Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible Debt, Fair Value Disclosures | $ 105,800 |  | 131,900 |  |
TVN [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Postemployment Benefits Liability | $ 100 |  | $ 800 |  |

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