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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | The changes in the carrying amount of goodwill and accumulated impairment losses were as follows:
|  | 2018 |  |  | 2017 |
|  | Gross Carrying Amount |  |  | Accumulated Impairment Loss |  |  | Net |  |  | Gross Carrying Amount |  |  | Accumulated Impairment Loss |  |  | Net |
Beginning balance at January |  | $ | 735,323 |  |  | $ | (144,276 | ) |  | $ | 591,047 |  |  | $ | 727,999 |  |  | $ | (139,414 | ) |  | $ | 588,585 |
Sale of business(1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,115 | ) |  |  | — |  |  |  | (3,115 | )
Impairment loss(2) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4,862 | ) |  |  | (4,862 | )
Foreign currency translation |  |  | (4,051 | ) |  |  | — |  |  |  | (4,051 | ) |  |  | 10,439 |  |  |  | — |  |  |  | 10,439 |
Ending balance at December 31 |  | $ | 731,272 |  |  | $ | (144,276 | ) |  | $ | 586,996 |  |  | $ | 735,323 |  |  | $ | (144,276 | ) |  | $ | 591,047 |
(1) | In 2017, the Company sold its Data Analytics business and, as a result, charged the related goodwill of $3,115 to the gain on sale of business.
(2) | In 2017, the Company recorded an impairment loss of $4,862 related to the write-off of goodwill as a result of the discontinuation of a product line and consolidation of two manufacturing plants.
Intangible Assets | Components of the Company’s acquired intangible assets are comprised of the following:
As of December 31, 2018 |  | Gross |  |  | Impairment Charges(1) |  |  | Accumulated Amortization |  |  | Foreign Currency Translation |  |  | Net |
Completed technology |  | $ | 172,431 |  |  | $ | (105 | ) |  | $ | (137,283 | ) |  | $ | (73 | ) |  | $ | 34,970 |
Customer relationships |  |  | 282,744 |  |  |  | (1,406 | ) |  |  | (63,788 | ) |  |  | (269 | ) |  |  | 217,281 |
Patents, trademarks, trade names and other |  |  | 110,523 |  |  |  | — |  |  |  | (42,954 | ) |  |  | (13 | ) |  |  | 67,556 |
|  | $ | 565,698 |  |  | $ | (1,511 | ) |  | $ | (244,025 | ) |  | $ | (355 | ) |  | $ | 319,807 |
As of December 31, 2017 |  | Gross |  |  | Impairment Charges(1) |  |  | Accumulated Amortization |  |  | Foreign Currency Translation |  |  | Net |
Completed technology |  | $ | 172,431 |  |  | $ | (105 | ) |  | $ | (115,371 | ) |  | $ | 333 |  |  | $ | 57,288 |
Customer relationships |  |  | 282,744 |  |  |  | (1,406 | ) |  |  | (45,518 | ) |  |  | 1,571 |  |  |  | 237,391 |
Patents, trademarks, trade names and other |  |  | 110,523 |  |  |  | — |  |  |  | (38,730 | ) |  |  | (74 | ) |  |  | 71,719 |
|  | $ | 565,698 |  |  | $ | (1,511 | ) |  | $ | (199,619 | ) |  | $ | 1,830 |  |  | $ | 366,398 |
(1) | In 2017, the Company recorded impairment charges of $1,511 related to the write-off of intangible assets as a result of the discontinuation of a product line and consolidation of two manufacturing plants.
Estimated Net Amortization Expense | Aggregate net amortization expense related to acquired intangible assets and unfavorable lease commitments for future years is:
Year |  | Amount |
2019 |  | $ | 40,073 |
2020 |  | $ | 28,076 |
2021 |  | $ | 20,206 |
2022 |  | $ | 17,584 |
2023 |  | $ | 17,220 |
Thereafter |  | $ | 138,693 |

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