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Intangible Assets | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Intangible assets, net, other than goodwill, at March 31, 2018 and December 31, 2017 are summarized as follows:
﻿ | 2018 |  | 2017 |  |
(in thousands) | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net |  | Weighted Average Useful Life Remaining (in years)
Intangible assets with finite lives: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 107,094 |  |  | $ | (61,287 | ) |  | $ | 45,807 |  |  | $ | 105,505 |  |  | $ | (57,796 | ) |  | $ | 47,709 |  |  | 6
Acquired technology | 50,370 |  |  | (38,108 | ) |  | 12,262 |  |  | 54,716 |  |  | (39,644 | ) |  | 15,072 |  |  | 2
Trade names | 25,972 |  |  | (16,381 | ) |  | 9,591 |  |  | 25,813 |  |  | (15,552 | ) |  | 10,261 |  |  | 6
Patent costs | 18,230 |  |  | (8,069 | ) |  | 10,161 |  |  | 17,909 |  |  | (7,338 | ) |  | 10,571 |  |  | 15
Trade secrets | 19,601 |  |  | (12,117 | ) |  | 7,484 |  |  | 19,431 |  |  | (11,530 | ) |  | 7,901 |  |  | 4
Acquired patents | 16,690 |  |  | (12,390 | ) |  | 4,300 |  |  | 16,661 |  |  | (11,969 | ) |  | 4,692 |  |  | 8
Other | 20,270 |  |  | (18,075 | ) |  | 2,195 |  |  | 20,012 |  |  | (17,435 | ) |  | 2,577 |  |  | 2
Total intangible assets | $ | 258,227 |  |  | $ | (166,427 | ) |  | $ | 91,800 |  |  | $ | 260,047 |  |  | $ | (161,264 | ) |  | $ | 98,783 |  |  | 6
(a) Change in gross carrying amounts consists primarily of charges for license and patent costs and foreign currency translation. Amortization expense related to intangible assets was $8,067 and $8,832 for the quarters ended March 31, 2018 and 2017, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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