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Revenues - Changes in Contract Assets and Liabilities under Topic 606 (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 29, 2019 | Mar. 30, 2018
Contract Assets - Current Portion |  |  |
Balance | [1] | $ 0 |
Increases as a result of a change in transaction price and recognition of revenues as services are performed |  | 10,222 |
Transfer to receivables from contract assets recognized at the beginning of the period |  | (543) |
Other |  | (2,435) |
Balance |  | 7,244 |
Contract Assets - Long-term Portion |  |  |
Increases as a result of a change in transaction price and recognition of revenues as services are performed |  | 1,450 |
Other |  | (1,450) |
Balance |  | 0 |
Contract Liabilities - Current Portion |  |  |
Balance | [1] | 0 |
Increases as a result of the deferral of milestones achieved in period, excluding amounts recognized as revenue |  | 0 |
Revenue recognized that was included in the contract liability balance at the beginning of the period |  | (1,313) |
Other |  | 3,689 |
Balance |  | 2,376 |
Contract Liabilities - Long-term Portion |  |  |
Balance | [1] | 15,897 |
Increases as a result of the deferral of milestones achieved in period, excluding amounts recognized as revenue |  | 0 |
Other |  | (7,574) |
Balance |  | 8,323 |
Revenues recognized for performance obligations satisfied in previous periods |  | 25,300 | $ 71,300
Balances Without the Adoption of Topic 606 |  |  |
Contract Assets - Current Portion |  |  |
Balance |  | 0 |
Contract Assets - Long-term Portion |  |  |
Balance |  | 0 |
Contract Liabilities - Current Portion |  |  |
Balance |  | 0 |
Contract Liabilities - Long-term Portion |  |  |
Balance |  | $ 15,897 |
[1] | The Condensed Consolidated Balance Sheet as of December 31, 2018 has been derived from the audited financial statements as of that date.

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