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Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible assets other than goodwill at December 31, 2018 and December 31, 2017 are summarized as follows:
﻿ |  | 2018 |  | 2017 |  |  |  |
(in thousands) |  | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net |  | Useful Life (in years) |  | Weighted Average Useful Life Remaining (in years)
Intangible assets with finite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 103,332 |  |  | $ | (67,129 | ) |  | $ | 36,203 |  |  | $ | 105,505 |  |  | $ | (57,796 | ) |  | $ | 47,709 |  |  | 1-12 |  | 5
Acquired technology |  | 52,691 |  |  | (47,546 | ) |  | 5,145 |  |  | 54,716 |  |  | (39,644 | ) |  | 15,072 |  |  | 1-2 |  | 2
Trade names |  | 25,096 |  |  | (17,669 | ) |  | 7,427 |  |  | 25,813 |  |  | (15,552 | ) |  | 10,261 |  |  | 3-6 |  | 5
Patent costs |  | 11,032 |  |  | (8,382 | ) |  | 2,650 |  |  | 17,909 |  |  | (7,338 | ) |  | 10,571 |  |  | 1-19 |  | 14
Trade secrets |  | 19,374 |  |  | (13,574 | ) |  | 5,800 |  |  | 19,431 |  |  | (11,530 | ) |  | 7,901 |  |  | 2-4 |  | 3
Acquired patents |  | 16,212 |  |  | (13,160 | ) |  | 3,052 |  |  | 16,661 |  |  | (11,969 | ) |  | 4,692 |  |  | 6-8 |  | 7
Other |  | 26,551 |  |  | (18,553 | ) |  | 7,998 |  |  | 20,012 |  |  | (17,435 | ) |  | 2,577 |  |  | 1-2 |  | 1
Total intangible assets |  | $ | 254,288 |  |  | $ | (186,013 | ) |  | $ | 68,275 |  |  | $ | 260,047 |  |  | $ | (161,264 | ) |  | $ | 98,783 |  |  | 1-19 |  | 5
The Company includes all amortization from assets attributable to the generation of revenue in the Cost of Sales line item in the Statement of Operations. Amortization related to assets that are not attributable to the generation of revenue are included in the Research and Development and Selling and General Administrative line items in the Statement of Operations. Amortization expense related to intangible assets was $29,722, $35,559 and $35,124 for the years ended December 31, 2018, 2017 and 2016, respectively. Amortization of these intangible assets is calculated on a straight-line basis. Annual amortization expense for intangible assets is expected to be $20,411 in 2019, $17,308 in 2020, $12,859 in 2021, $7,493 in 2022 and $2,526 in 2023. For discussion on intangible asset impairment testing, see Note 2.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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