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Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 31, 2017 | Dec. 30, 2017
Condensed Consolidated Statements of Cash Flows |  |  |  |  |  |
Accounts receivable, net |  |  | $ 16,705 | $ 887 |  |
Prepaid expenses and other current assets |  |  | 1,759 | (12,539) |  |
Deferred revenue and returns liability |  |  | (4,193) | 3,251 |  |
Condensed Consolidated Statements of Income |  |  |  |  |  |
Cost of revenues | $ 85,814 | $ 76,906 | 166,961 | 150,773 |  |
Net income | $ 14,280 | $ 16,569 | $ 40,685 | $ 31,995 |  |
Earnings per share: |  |  |  |  |  |
Basic (in dollars per share) | $ 0.33 | $ 0.39 | $ 0.94 | $ 0.76 |  |
Diluted (in dollars per share) | $ 0.32 | $ 0.38 | $ 0.92 | $ 0.74 |  |
Condensed Consolidated Balance Sheet |  |  |  |  |  |
Prepaid expenses and other current assets | $ 52,642 |  | $ 52,642 |  |  | $ 39,120
Goodwill | 396,689 |  | 396,689 |  |  | 288,227
Other assets, net | 95,385 |  | 95,385 |  |  | 88,387
Deferred revenue and returns liability | 24,503 |  | 24,503 |  |  |
Deferred income on shipments to distributors |  |  |  |  |  | 50,115
Other current liabilities | 74,254 |  | 74,254 |  |  | 73,359
Retained earnings | 918,440 |  | $ 918,440 |  |  | $ 851,307
Performance Obligations |  |  |  |  |  |
Product replacement warranty |  |  | 1 year |  |  |
ASU 2014-09 - Revenue from Contracts with Customers |  |  |  |  |  |
Condensed Consolidated Statements of Cash Flows |  |  |  |  |  |
Accounts receivable, net |  |  | $ 230 |  |  |
Prepaid expenses and other current assets |  |  | 7,579 |  |  |
Other assets, net |  |  | (2,282) |  |  |
Deferred revenue and returns liability |  |  | 27,806 |  |  |
Deferred income on shipments to distributors |  |  | (50,115) |  |  |
Other current liabilities |  |  | 1,641 |  |  |
Retained earnings |  |  | 26,195 |  |  |
Condensed Consolidated Statements of Income |  |  |  |  |  |
Revenue | 7,464 |  | 8,162 |  |  |
Cost of revenues | 2,233 |  | 1,983 |  |  |
Net income | $ 4,507 |  | $ 4,897 |  |  |
Earnings per share: |  |  |  |  |  |
Basic (in dollars per share) | $ 0.10 |  | $ 0.11 |  |  |
Diluted (in dollars per share) | $ 0.10 |  | $ 0.11 |  |  |
Condensed Consolidated Balance Sheet |  |  |  |  |  |
Prepaid expenses and other current assets | $ 2,959 |  | $ 2,959 |  |  |
Goodwill | (2,842) |  | (2,842) |  |  |
Other assets, net | (3,559) |  | (3,559) |  |  |
Deferred revenue and returns liability | 24,503 |  | 24,503 |  |  |
Deferred income on shipments to distributors | (64,936) |  | (64,936) |  |  |
Other current liabilities | 5,485 |  | 5,485 |  |  |
Retained earnings | $ 31,092 |  | $ 31,092 |  | $ 26,200 |

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