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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | The changes in the carrying amount of goodwill and accumulated impairment (loss) during the six months ended June 30, 2018 and year ended December 31, 2017 were as follows:
|  | Six Months Ended June 30, 2018 |  |  | Twelve Months Ended December 31, 2017 |
|  | Gross Carrying Amount |  |  | Accumulated Impairment (Loss) |  |  | Net |  |  | Gross Carrying Amount |  |  | Accumulated Impairment (Loss) |  |  | Net |
Beginning balance at January 1 |  | $ | 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 |  |  | (2,329 | ) |  |  | — |  |  |  | (2,329 | ) |  |  | 10,439 |  |  |  | — |  |  |  | 10,439 |
Ending balance at June 30, 2018 and December 31, 2017 |  | $ | 732,994 |  |  | $ | (144,276 | ) |  | $ | 588,718 |  |  | $ | 735,323 |  |  | $ | (144,276 | ) |  | $ | 591,047 |
(1) | In 2017, the Company sold its Data Analytics Solutions 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 related to the discontinuation of a product line and consolidation of two manufacturing plants.
Intangible Assets | Components of the Company’s intangible assets are comprised of the following:
As of June 30, 2018: |  | Gross |  |  | Impairment Charges(1) |  |  | Accumulated Amortization |  |  | Foreign Currency Translation |  |  | Net |
Completed technology |  | $ | 172,431 |  |  | $ | (105 | ) |  | $ | (126,383 | ) |  | $ | 26 |  |  | $ | 45,969 |
Customer relationships |  |  | 282,744 |  |  |  | (1,406 | ) |  |  | (54,712 | ) |  |  | 550 |  |  |  | 227,176 |
Patents, trademarks, trade names and other |  |  | 110,523 |  |  |  | — |  |  |  | (40,985 | ) |  |  | 1 |  |  |  | 69,539 |
|  | $ | 565,698 |  |  | $ | (1,511 | ) |  | $ | (222,080 | ) |  | $ | 577 |  |  | $ | 342,684 |
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 as follows:
Year |  | Amount |
2018 (remaining) |  | $ | 21,475 |
2019 |  |  | 40,182 |
2020 |  |  | 28,152 |
2021 |  |  | 20,272 |
2022 |  |  | 17,645 |
2023 |  |  | 17,280 |
Thereafter |  |  | 139,195 |

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