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Revenues - Changes in Contract Assets and Liabilities under Topic 606 (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2018 | Sep. 28, 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 |  |  | 37,744
Transfer to receivables from contract assets recognized at the beginning of the period |  |  | (9,109)
Other |  |  | (13,734)
Balance |  | $ 24,489 | 24,489
Contract Assets - Long-term Portion |  |  |
Increases as a result of a change in transaction price and recognition of revenues as services are performed |  |  | 4,037
Other |  |  | (16,284)
Balance |  | 0 | 0
Contract Liabilities - Current Portion |  |  |
Balance | [1] |  | 31,984
Increases as a result of the deferral of milestones achieved in period, excluding amounts recognized as revenue |  |  | 873
Revenue recognized that was included in the contract liability balance at the beginning of the period |  |  | (6,114)
Other |  |  | (3,152)
Balance |  | 0 | 0
Contract Liabilities - Long-term Portion |  |  |
Balance | [1] |  | 238,520
Increases as a result of the deferral of milestones achieved in period, excluding amounts recognized as revenue |  |  | 3,712
Revenue recognized that was included in the contract liability balance at the beginning of the period |  |  | 0
Other |  |  | (26,885)
Balance |  | 2,268 | 2,268
Revenues recognized for performance obligations satisfied in previous periods |  | $ 48,200 | 151,800
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 |  |  | 31,984
Contract Liabilities - Long-term Portion |  |  |
Balance |  |  | $ 238,520
[1] | The Condensed Consolidated Balance Sheet as of December 31, 2017 has been derived from the audited financial statements as of that date.

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