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Intangible Assets | 3 Months Ended
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Mar. 31, 2016
Intangible Assets [Abstract] |
Intangible Assets | (5) Intangible Assets ﻿ Intangible assets, net, other than goodwill as of March 31, 2016 and December 31, 2015 were as follows:
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 2016 |  | 2015 |  |  |  |
﻿(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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Patent costs | $ | 16,547 |  | $ | (5,248) |  | $ | 11,299 |  | $ | 16,251 |  | $ | (4,895) |  | $ | 11,356 |  | 1-19 |  | 8
﻿Acquired technology |  | 53,735 |  |  | (19,497) |  |  | 34,238 |  |  | 52,809 |  |  | (16,405) |  |  | 36,404 |  | 2-15 |  | 4
﻿Internally developed software |  | 4,730 |  |  | (3,069) |  |  | 1,661 |  |  | 4,730 |  |  | (2,919) |  |  | 1,811 |  | 3 |  | 3
﻿Customer relationships |  | 103,825 |  |  | (39,768) |  |  | 64,057 |  |  | 101,933 |  |  | (36,158) |  |  | 65,775 |  | 2-15 |  | 7
﻿Non-compete agreements |  | 12,043 |  |  | (8,722) |  |  | 3,321 |  |  | 12,163 |  |  | (8,558) |  |  | 3,605 |  | 2-5 |  | 3
﻿Trade names |  | 28,347 |  |  | (13,456) |  |  | 14,891 |  |  | 28,108 |  |  | (12,498) |  |  | 15,610 |  | 1-9 |  | 6
﻿Other |  | 46,455 |  |  | (24,556) |  |  | 21,899 |  |  | 46,435 |  |  | (23,530) |  |  | 22,905 |  | 1-7 |  | 5
﻿Total intangible assets | $ | 265,682 |  | $ | (114,316) |  | $ | 151,366 |  | $ | 262,429 |  | $ | (104,963) |  | $ | 157,466 |  | 1-19 |  | 5
﻿ Amortization expense related to costs incurred to internally develop and extend patents in the United States and various other countries was $84 and $75 for the quarters ended March 31, 2016 and 2015, respectively. ﻿ Amortization expense related to all other intangible assets was $8,735 and $14,441 for the quarters ended March 31, 2016 and 2015, respectively. ﻿ Annual amortization expense for intangible assets is expected to be $35,180, $32,233, $27,022, $21,737 and $17,200 for the years ending 2016, 2017, 2018, 2019, and 2020, 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=26713463&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=26713463&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=26713463&loc=d3e16373-109275 + Details
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