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Intangible Assets | 3 Months Ended
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Mar. 31, 2015
Intangible Assets [Abstract] |
Intangible Assets | (5) Intangible Assets Intangible assets other than goodwill at March 31, 2015 and December 31, 2014 were as follows:
| 2015 |  | 2014 |  |  |  |
(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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Licenses | $ | 5,875 |  | $ | (5,875) |  | $ | — |  | $ | 5,875 |  | $ | (5,875) |  | $ | — |  | N/A |  | N/A
Patent costs |  | 20,949 |  |  | (7,613) |  |  | 13,336 |  |  | 20,733 |  |  | (7,369) |  |  | 13,364 |  | 5-20 |  | 3
Acquired technology |  | 71,498 |  |  | (20,687) |  |  | 50,811 |  |  | 57,383 |  |  | (18,241) |  |  | 39,142 |  | 3-10 |  | 4
Internally developed software |  | 9,072 |  |  | (5,878) |  |  | 3,194 |  |  | 9,073 |  |  | (5,517) |  |  | 3,556 |  | 1-8 |  | <1
Customer relationships |  | 185,497 |  |  | (39,163) |  |  | 146,334 |  |  | 157,139 |  |  | (36,975) |  |  | 120,164 |  | 3-11 |  | 2
Non-compete agreements |  | 35,114 |  |  | (12,637) |  |  | 22,477 |  |  | 35,469 |  |  | (11,784) |  |  | 23,685 |  | 3-11 |  | 3
Trade names |  | 26,774 |  |  | (4,684) |  |  | 22,090 |  |  | 21,800 |  |  | (4,455) |  |  | 17,345 |  | 2-10 |  | 5
Other |  | 41,983 |  |  | (8,854) |  |  | 33,129 |  |  | 39,100 |  |  | (6,905) |  |  | 32,195 |  | 4-10 |  | 1
Intangible assets with indefinite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  | 2,110 |  |  | — |  |  | 2,110 |  |  | 2,110 |  |  | — |  |  | 2,110 |  | N/A |  | N/A
Total intangible assets | $ | 398,872 |  | $ | (105,391) |  | $ | 293,481 |  | $ | 348,682 |  | $ | (97,121) |  | $ | 251,561 |  | 1-20 |  | 4
For the quarter ended March 31, 2015 and 2014, the Company capitalized $203 and $210, respectively, of costs incurred to internally develop and extend patents in the United States and various other countries. Amortization expense of intangible assets for the quarter ended March 31, 2015 and 2014 was $14,517 and $9,204 respectively. Annual amortization expense for intangible assets is expected to be $54,467, $48,813, $43,796, $35,663 and $25,876 for the years ended 2015, 2016, 2017, 2018 and 2019, respectively.

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