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Intangible Assets | 3 Months Ended
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Mar. 31, 2014
Intangible Assets [Abstract] |
Intangible Assets | (5) Intangible Assets Intangible assets other than goodwill at March 31, 2014 and December 31, 2013 were as follows:
| 2014 |  | 2013 |  |  |  |
(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) |  | $ | — |  |  |  |
Patent costs |  | 21,714 |  |  | (6,113) |  |  | 15,601 |  |  | 21,545 |  |  | (5,960) |  |  | 15,585 |  | 6 - 7 |  | 3
Acquired technology |  | 32,498 |  |  | (14,185) |  |  | 18,313 |  |  | 30,095 |  |  | (13,615) |  |  | 16,480 |  | 5 - 10 |  | 5
Internally developed software |  | 17,847 |  |  | (13,223) |  |  | 4,624 |  |  | 18,097 |  |  | (12,863) |  |  | 5,234 |  | 5 |  | <1
Customer relationships |  | 99,966 |  |  | (24,089) |  |  | 75,877 |  |  | 95,793 |  |  | (18,283) |  |  | 77,510 |  | 5 - 13 |  | 5
Non-compete agreements |  | 20,445 |  |  | (7,635) |  |  | 12,810 |  |  | 16,848 |  |  | (6,666) |  |  | 10,182 |  | 3 - 11 |  | 3
Trade names |  | 10,627 |  |  | (2,834) |  |  | 7,793 |  |  | 9,302 |  |  | (2,211) |  |  | 7,091 |  | 2 - 10 |  | 3
Other |  | 18,637 |  |  | (4,819) |  |  | 13,818 |  |  | 11,598 |  |  | (4,081) |  |  | 7,517 |  | <1 - 7 |  | 2
Intangible assets with indefinite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  | 2,110 |  |  | — |  |  | 2,110 |  |  | 2,110 |  |  | — |  |  | 2,110 |  | N/A |  | N/A
Total intangible assets | $ | 229,719 |  | $ | (78,773) |  | $ | 150,946 |  | $ | 211,263 |  | $ | (69,554) |  | $ | 141,709 |  | <1 - 13 |  | 4
For the quarters ended March 31, 2014 and 2013, the Company capitalized $210 and $177, respectively, of costs incurred to acquire, develop and extend patents in the United States and various other countries. Amortization expense for intangible assets for the quarters ended March 31, 2014 and 2013 was $9,204 and $3,812, respectively. Annual amortization expense for intangible assets for 2014, 2015, 2016, 2017 and 2018 is expected to be $29,767, $23,754, $20,752, $17,799 and $13,094, respectively.

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