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Intangible Assets | 6 Months Ended
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Jun. 30, 2016
Intangible Assets [Abstract] |
Intangible Assets | (4) Intangible Assets ﻿ Intangible assets, net, other than goodwill, as of June 30, 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 | $ | 16,377 |  | $ | (5,457) |  | $ | 10,920 |  | $ | 16,251 |  | $ | (4,895) |  | $ | 11,356 |  | 1-19 |  | 8
﻿Acquired technology |  | 53,161 |  |  | (22,075) |  |  | 31,086 |  |  | 52,809 |  |  | (16,405) |  |  | 36,404 |  | 2-15 |  | 4
﻿Internally developed software |  | 4,730 |  |  | (3,220) |  |  | 1,510 |  |  | 4,730 |  |  | (2,919) |  |  | 1,811 |  | 3 |  | 3
﻿Customer relationships |  | 102,585 |  |  | (42,315) |  |  | 60,270 |  |  | 101,933 |  |  | (36,158) |  |  | 65,775 |  | 2-15 |  | 7
﻿Non-compete agreements |  | 11,808 |  |  | (8,916) |  |  | 2,892 |  |  | 12,163 |  |  | (8,558) |  |  | 3,605 |  | 2-5 |  | 3
﻿Trade names |  | 28,352 |  |  | (14,386) |  |  | 13,966 |  |  | 28,108 |  |  | (12,498) |  |  | 15,610 |  | 1-9 |  | 6
﻿Other |  | 46,202 |  |  | (25,765) |  |  | 20,437 |  |  | 46,435 |  |  | (23,530) |  |  | 22,905 |  | 1-7 |  | 5
﻿Total intangible assets | $ | 263,215 |  | $ | (122,134) |  | $ | 141,081 |  | $ | 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 $81 and $165 for the quarter and six months ended June 30, 2016, respectively, compared to $76 and $151 for the quarter and six months ended June 30, 2015, respectively. ﻿ Amortization expense related to all other intangible assets was $8,779 and $17,514 for the quarter and six months ended June 30, 2016, respectively, compared to $17,4 05 and $31,846 for the quarter and six months ended June 30, 2015, respectively. ﻿ Annual amortization expense for intangible assets is expected to be $35,358, $32,134, $26,962, $21,626 and $16,932 for the years ending 2016, 2017, 2018, 2019, and 2020, respectively.

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