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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Allowance for Doubtful Accounts Roll Forward | The following is a summary of the activity of the Company’s allowance for doubtful accounts for the six months ended June 30, 2018 and July 1, 2017 (in thousands):
|  | Balance at Beginning of Period |  |  | Additions |  |  | Deduction |  |  | Balance at End of Period |
Allowance for Doubtful Accounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 30, 2018 |  | $ | 6,109 |  |  | $ | 1,825 |  |  | $ | (1,778 | ) |  | $ | 6,156 |
July 1, 2017 |  | $ | 5,140 |  |  | $ | 1,571 |  |  | $ | (1,228 | ) |  | $ | 5,483 |
Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table represents the Company’s assets and liabilities measured at fair value on a recurring basis at June 30, 2018 (in thousands):
|  | Total at June 30, 2018 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 237,759 |  |  | $ | — |  |  | $ | 237,759 |  |  | $ | — |
Foreign government securities |  |  | 2,954 |  |  |  | — |  |  |  | 2,954 |  |  |  | — |
Corporate debt securities |  |  | 1,198,549 |  |  |  | — |  |  |  | 1,198,549 |  |  |  | — |
Time deposits |  |  | 238,314 |  |  |  | — |  |  |  | 238,314 |  |  |  | — |
Equity securities |  |  | 147 |  |  |  | — |  |  |  | 147 |  |  |  | — |
Waters 401(k) Restoration Plan assets |  |  | 36,309 |  |  |  | 36,309 |  |  |  | — |  |  |  | — |
Foreign currency exchange contracts |  |  | 167 |  |  |  | — |  |  |  | 167 |  |  |  | — |
Total |  | $ | 1,714,199 |  |  | $ | 36,309 |  |  | $ | 1,677,890 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | 3,550 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,550 |
Foreign currency exchange contracts |  |  | 875 |  |  |  | — |  |  |  | 875 |  |  |  | — |
Total |  | $ | 4,425 |  |  | $ | — |  |  | $ | 875 |  |  | $ | 3,550 |
The following table represents the Company’s assets and liabilities measured at fair value on a recurring basis at December 31, 2017 (in thousands):
|  | Total at December 31, 2017 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 591,988 |  |  | $ | — |  |  | $ | 591,988 |  |  | $ | — |
Foreign government securities |  |  | 6,952 |  |  |  | — |  |  |  | 6,952 |  |  |  | — |
Corporate debt securities |  |  | 1,975,160 |  |  |  | — |  |  |  | 1,975,160 |  |  |  | — |
Time deposits |  |  | 371,511 |  |  |  | — |  |  |  | 371,511 |  |  |  | — |
Equity securities |  |  | 147 |  |  |  | — |  |  |  | 147 |  |  |  | — |
Waters 401(k) Restoration Plan assets |  |  | 35,645 |  |  |  | 35,645 |  |  |  | — |  |  |  | — |
Foreign currency exchange contracts |  |  | 566 |  |  |  | — |  |  |  | 566 |  |  |  | — |
Total |  | $ | 2,981,969 |  |  | $ | 35,645 |  |  | $ | 2,946,324 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | 3,247 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,247 |
Foreign currency exchange contracts |  |  | 182 |  |  |  | — |  |  |  | 182 |  |  |  | — |
Total |  | $ | 3,429 |  |  | $ | — |  |  | $ | 182 |  |  | $ | 3,247 |
Fair Value of Forward Foreign Exchange Contracts | The Company’s foreign currency exchange contracts included in the consolidated balance sheets are classified as follows (in thousands):
|  | June 30, 2018 |  |  | December 31, 2017 |
Other current assets |  | $ | 167 |  |  | $ | 566 |
Other current liabilities |  | $ | 875 |  |  | $ | 182 |
Gains (Losses) on Foreign Exchange Contracts | The following is a summary of the activity included in cost of sales in the statements of operations related to the foreign currency exchange contracts (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, 2018 |  |  | July 1, 2017 |  |  | June 30, 2018 |  |  | July 1, 2017 |
Realized (losses) gains on closed contracts |  | $ | (4,096 | ) |  | $ | 1,868 |  |  | $ | (2,158 | ) |  | $ | 430 |
Unrealized (losses) gains on open contracts |  |  | (105 | ) |  |  | 2,209 |  |  |  | (1,092 | ) |  |  | 2,077 |
Cumulative net pre-tax (losses) gains |  | $ | (4,201 | ) |  | $ | 4,077 |  |  | $ | (3,250 | ) |  | $ | 2,507 |
Summary of Activity of Company's Accrued Warranty Liability | The following is a summary of the activity of the Company’s accrued warranty liability for the six months ended June 30, 2018 and July 1, 2017 (in thousands):
|  | Balance at Beginning of Period |  |  | Accruals for Warranties |  |  | Settlements Made |  |  | Balance at End of Period |
Accrued warranty liability: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 30, 2018 |  | $ | 13,026 |  |  | $ | 3,588 |  |  | $ | (4,115 | ) |  | $ | 12,499 |
July 1, 2017 |  | $ | 13,391 |  |  | $ | 3,842 |  |  | $ | (4,369 | ) |  | $ | 12,864 |

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